From Power Levels to Performance Index
When I first built DeckCheck, the Commander community had a problem that everyone acknowledged but nobody had solved: power levels meant different things to different people. One player's "7" was another player's "5." Sitting down at an LGS was a coin flip on whether you'd actually have a good game. DeckCheck's power level system was my attempt at an objective anchor: a number grounded in first principles like win-turn estimation, not vibes.
It worked. It's been incredible watching this community rally around the idea that decks can be evaluated based on how they actually perform, not just how they feel. But the landscape has changed, and I think it's time DeckCheck evolves with it.
Two weeks from today (so on March 12, 2026), DeckCheck will remove power levels from the site and replace it with a new system/metric: the Performance Index.
Before I explain the new system, I want to walk you through why stuff is changing in the first place. This isn't a decision I made lightly. Heck, I've spend so much time thinking about and building the power level system as you see it today, it's hard to let it go. But, after tons of thinking, testing, and most importantly, listening to y'all, it was time to make a decision.
The Bracket System Got Good, and It's Here to Stay
I've been publicly skeptical of the Commander Format Panel's bracket system. In my original "On Power" essay, I argued that top-down solutions would likely always fall short because they lack the granularity and cheat-proofing that a tool like DeckCheck provides. I wrote that brackets were vulnerable to being gamed (for example "Bracket 1 cEDH" decks), that five tiers weren't enough, and that I didn't believe the solution could come from the top.
Here's the thing about being a serious thinker: sometimes the thing you criticized evolves into something better, and intellectual honesty requires you to acknowledge that.
The bracket system improved significantly. The most important change was the introduction of turn-speed baselines for each bracket. Once brackets incorporated thresholds like "games should last at least 9 turns" for Bracket 1, "at least 8 turns" for Bracket 2 and so on, they essentially adopted the framework I was advocating for: objective, measurable criteria rooted in the game's turn structure. Combine that with the Game Changers list, combo restrictions, mass land denial rules, and extra-turn limits, and you've got a system with real structural teeth now.
But, more importantly, brackets became the shared language I was hoping to create, and it comes as no suprise. This is the advantage of a top-down system: it gets adopted quickly. Granted, not everyone is using brackets even to this day, but when there is a proper pre-game discussion, you never hear "what's your power level?" "What bracket are you?" has fully replaced that, and that shift matters significantly. A system only works if people actually use it, and people are using bracket system, not DeckCheck's.
The Two-Number Problem
With the updates to the bracket system, DeckCheck's ratings don't really have a good-enough reason to compete as "the best way to describe power" as it once did. DeckCheck is currently showing users both a power level AND a bracket, two numbers claiming to answer the same question: "how strong is my deck?"
That sounds like more information, which should be better. But in practice, it creates confusion, especially for new players or folks who aren't familiar with DeckCheck and what it's power levels mean. If your bracket says 3 but your power level says 6.5, what do you tell the table? Which number matters? When they agree, one is redundant. When they disagree, it undermines confidence in both. In reality, people are just using brackets these days unless they've convinced their entire pod to use DeckCheck, and that's the reality I have to design for.
What You Told Me
I brought this question to the DeckCheck Discord community before making any decisions. The response was thoughtful and genuinely changed my thinking and resulted in the new system that will be implemented. Another W for "community knows best."
The community confirmed what I was seeing at tables: brackets have become the pregame language. As one user put it, "I haven't heard power level mentioned IRL since brackets were introduced."
But they also surfaced something I hadn't fully accounted for in my own thoughts on this subject: Several described using the power level number not for pregame conversations, but as a personal tuning tool: a way to compare their own decks against each other and track whether card swaps were moving the deck in the desired direction. Many users described the process of tweaking a deck, re-analyzing it, and seeing where the number landed compared to the previous version. That iteration feedback loop is something the bracket system can't provide and it's a core experience of building on DeckCheck. A deck can go from a 4.5 to a 6.0 and still be Bracket 3 both times, but those are very different decks, and it's clear y'all want to be able to see that difference still.
Additionally, a second issue was raised: The bracket system still has its some critical problems. Bracket 3, in particular, covers a huge range of play experiences and as one user pointed out "...DeckCheck helps show the variance within it." The power level was serving as an intra-bracket differentiator, and removing it without a replacement would leave a real gap that DeckCheck currently fills.
So, DeckCheck power levels are still solving two problems: iteration and intra-bracket differentiation, both of which the current bracket system doesn't solve. Even so, DCs power levels are was still competing with the bracket in a way that confuses people. So, the question became "is there a way to serve both purposes without the confusion?"
Introducing Performance Index
The Performance Index (PI) is the answer. Here's how it works.
DeckCheck already rates every deck on four attributes: Speed (how quickly the deck wins), Resilience (how well it handles disruption), Consistency (how reliably it finds and executes its plan), and Interaction (how effectively it disrupts opponents and protects itself). These have always been part of the analysis, but they've lived somewhat in the background.
The Performance Index is simply the average of these four ratings. All four are scored 1–10. The average gives you a single composite number, also on a 1–10 scale.
Speed: 7 | Resilience: 5 | Consistency: 6 | Interaction: 7 → Performance Index: 6.25
That's it. No conversion tables, no hidden math, no black boxes.
Your DeckCheck experience will now look like this:
Bracket 3: Upgraded
PI: 6.25
Bracket and PI combined tell you how your deck plays, which helps you better gauge if you ought to play in a higher or lower bracket than what your technically in. And, you still get a mechanism for comparison and iteration.
Why This Is Better
It's transparent. The old power level was essentially a black box. You could see the number but you couldn't see exactly why it was what it was. The Performance Index is visibly derived from four numbers that are right in front of you. If your Performance Index is 6.25, you can see immediately that your decks low Resilience is dragging things down. No mystery.
It's actionable. "Your power level is 5.5" doesn't tell you what to you likely need to change. "Your Resilience is 4 because you have a single win line and limited recursion" tells you exactly what to fix if your looking to strengthen you deck. Add a backup win condition. Add recursion pieces like Eternal Witness or Regrowth. Reduce your commander dependency. Re-analyze. Watch the Resilience score climb and the Performance Index move with it. That's the feedback loop folks are looking for.
It doesn't compete with brackets. This was the core problem and what started this whole thing. The power level and the bracket were both trying to answer "how strong is your deck?" and stepping on each other. The Performance Index answers a different question: "how well does your deck perform within its bracket?" Those are complementary, not competing. The bracket is for the table. The Performance Index is for your deckbuilding.
It captures intra-bracket variance. I tested this against my own decks: I have three Bracket 3 decks that each play wildly different. Under the new system, they came back as 6.75, 6.5, and 6.0. That ranking matches exactly how I'd rank them from experience. My 6.75 is the most well-rounded, strong across all four stats. My 6.5 is technically faster (higher Speed) but fragile (lower Resilience)—it wins on turn 5 if uninterrupted but crumbles to a board wipe. My 6.0 is clearly a step below both. Three decks, same bracket, clearly differentiated.
All of this culminates into one reality: knowing your deck better. Having this Performance Index allows you to understand your deck in a way that allows you to make better choices pre-game. If your deck is Bracket 3 but is on the absolute edge of Bracket 3, likely you should play that in a Bracket 4 pod.
Grounded Stats, Not Vibes
Here's the part I'm most excited about. As part of this transition, I've completely overhauled how the four attribute ratings are calculated.
Previously, the AI assigned ratings based on a holistic impression of the deck, informed by deep knowledge of Magic and some metrics, but ultimately mostly subjective. "This feels like a 6 for Consistency." That's better than nothing, but it's not what DeckCheck should aspire to.
The new system grounds each rating in concrete, countable inputs. Here's what that means for each stat:
Speed
Anchored to the deck's estimated realistic win turn. Not the god-hand best-case, not the worst-case, but the median realistic win turn in a typical 4-player pod. The AI counts your mana acceleration pieces, identifies your fastest win line, evaluates whether that line is supported by redundancy or requires specific cards, and maps the result to a clear level.
Consistency
Built from tutor count (weighted by efficiency; a Demonic Tutor at 2 mana matters more than a Diabolic Tutor at 4), card draw engine count (repeatable engines like Sylvan Library count more than one-shot draw), redundancy of key effects (how many cards serve each critical role in your strategy), and mana base reliability. A deck with 6+ efficient tutors, 4+ repeatable draw engines, and redundant copies of every key effect is far more consistent that a deck with no tutors and no card advantage.
Interaction
Counts your removal (weighted by cost and flexibility), counterspells (free counters weighted highest), board wipes, stax pieces, and protection suite. It also assesses coverage (can you answer creatures, artifacts, enchantments, and stack-based threat?) and your instant-speed ratio. Full coverage with 12+ interaction pieces including free counters is far better than 2 sorcery-speed removal spells and nothing else.
Resilience
Evaluates independent win lines (distinct paths to victory that don't share critical pieces), recursion density, ability to recover from board wipes, commander dependency (how much does your deck's performance degrade without the commander?), and redundancy of engine pieces. A deck with 3+ independent win lines, strong recursion, and that functions at 80%+ without its commander is will rate significantly higher than a deck that folds to a single counterspell on its only combo piece.
The key shift: each of these ratings can now be strategically improved. If you see Resilience: 4, you know you need more win lines, more recursion, or less commander dependency. Make those changes, re-analyze, and the number moves. That's not vibes—that's a tuning tool.
What Happens to Bracket Accuracy
DeckCheck's bracket calculation is considered the most accurate available because it doesn't just check the official bracket rules. It uses performance-based guardrails to catch decks that technically meet a lower bracket's rules but clearly play above that level. This is how DeckCheck catches those Bracket 3 decks that really ought to be playing in Bracket 4.
Instead of power level setting the bracket floor (as it currently does on DeckCheck), the new guardrails use both Speed and Performance Index independently. Either one can trigger a bracket bump on its own:
A glass cannon that wins on turn 3 but folds to any interaction gets a high Speed score. Even if the overall Performance Index is moderate (because Resilience and Consistency are low), Speed alone triggers the bracket bump. It's not sitting in Bracket 2 just because it's fragile.
A well-rounded powerhouse that doesn't win particularly fast but scores 8+ in Resilience, Consistency, and Interaction gets a high Performance Index. Even if Speed is moderate, the overall strength triggers the bump. It's not staying in Bracket 3 just because it wins on turn 9 even though it's locked you out since turn 3.
And because both inputs are visible to you, if your deck gets bumped from Bracket 3 to 4, you can see exactly why: was it because your deck is too fast, or because it's too strong overall? That transparency never existed with the old system and certainly doesn't exist on other sites.
What's Not Changing
The full deck analysis (overview, primer, win conditions, weaknesses, key cards, etc.) stays exactly the same and continues to improve. Search and filtering remain functionally the same: you'll be able to filter by bracket AND Performance Index range, finding exactly the tier of deck you're looking for within any bracket.
Closing Thoughts
DeckCheck started as a single page with a nifty little power level calculator but now it's become something much bigger: a deckbuilding platform that helps you understand your deck, find its bracket, identify its strengths and weaknesses, and iteratively improve it. The Performance Index system aligns with that evolution.
Brackets are the shared language for the pregame conversation. DeckCheck's job is to make sure you're representing your deck as accurately as possible and to give you the tools to build exactly the kind of experience you're looking for. The Performance Index, grounded in four transparent and actionable stats, does that better than a single opaque power level number ever could.
This change goes live March 12, 2026. Until then, I'll be watching the comments here and will be in the Discord answering questions and gathering any further feedback.
Until next time,
Anthony
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