BufferPower
Prevent the next time times} you would lose HP.
Is Buffer good in Slay the Spire 2?
Buffer is a rare Defect power in Slay the Spire 2. In combat it resolves as: Prevent the next time times} you would lose HP. It’s a dependable, middle-of-the-pack option, landing at C tier in our rankings.
Across 45 recorded runs, decks running it win 30.9% of the time, comfortably clear of the 18.9% average, by 12.0%. It’s a more selective pick, turning up in just 1.2% of decks that could run it. Regent players keep it in 0.1% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.1 times in the decks that take it.
It performs best next to Machine Learning — together they post a +16.7% swing in win rate. It also has strong chemistry with the relic Pendulum, which moves its win rate by +24.5%. At 2 energy, it’s upgraded in 32.0% of runs and usually joins the deck around floor 22.
That’s 13 wins, 29 deaths, and 3 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Queen Boss, which closes out 11.1% of its appearances. Read on for Buffer’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Defect run.
Buffer Win Rate & Pick Rate
Buffer’s 30.9% win rate clears the 18.9% all-deck average by 12.0%, the gap charted below.
Run Outcomes with Buffer
Buffer has 13 wins and 32 losses over 45 tracked runs (28.9% won); abandoned runs count as losses.
- Wins 28.9%
- Losses 71.1%
Best Cards to Pair with Buffer
Ranked by win-rate lift, Buffer performs best alongside Machine Learning (+16.7%), Scrape (+16.7%), and Subroutine (+15.3%).
Machine Learning8 runs
Scrape7 runs
Subroutine16 runs
Trash to Treasure8 runs
Clumsy8 runs
Iteration6 runsBased on small co-occurring samples — treat these as early signals, not final verdicts.
Buffer Win Rate by Class
Buffer is played across 3 classes, led by Regent (100.0%), Defect (30.8%), and Necrobinder (0.0%) by win rate.
Best Relics for Buffer
Buffer pairs best with the relics Pendulum (+24.5%), Tiny Mailbox (+22.6%), and Oddly Smooth Stone (+16.7%), ranked by win-rate lift.
Based on small co-occurring samples — treat these as early signals, not final verdicts.
Buffer Card Details
Buffer is a rare power costing 2 energy; it’s upgraded in 32.0% of runs and usually picked up by floor 22.
Prevent the next time times} you would lose HP.
What Ends Runs with Buffer
Buffer’s most common run-enders are Queen Boss (11.1%), Test Subject Boss (8.9%), and Aeonglass Boss (6.7%).
- Queen Boss11.1% of runs
- Test Subject Boss8.9% of runs
- Aeonglass Boss6.7% of runs
- Entomancer Elite6.7% of runs
- Kaiser Crab Boss4.4% of runs
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Buffer – Frequently Asked Questions
Is Buffer good in Slay the Spire 2?
Across 45 tracked runs, Buffer has a 30.9% win rate — +12.0% above the average deck. Win rate reflects how often runs that include the card end in victory.
What does Buffer do in Slay the Spire 2?
Buffer costs 2 energy. Prevent the next time times} you would lose HP.
What class is Buffer in Slay the Spire 2?
Buffer is a Rare Defect Power.
Is Buffer worth upgrading in Slay the Spire 2?
Buffer can be upgraded at a rest site to improve its effect.
What is the best relic for Buffer?
In tracked runs, Buffer has performed best alongside Pendulum, which lifts its win rate by +24.5% over 10 runs together.
See Also
Compare Buffer with the rest of the best Slay the Spire 2 cards, relics, and classes below.