- Win Rate
- 20.0%
- Pick Rate
- 0.2%
- Δ vs Avg
- +6.0
Stack Skill
- Type
- Skill
- Rarity
- Event
- Cost
- 1
- Class
- Event
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Gain Block equal to the number of cards in your Discard Pile|}.
Is Stack good in Slay the Spire 2?
Stack is an event Event skill in Slay the Spire 2. In combat it resolves as: Gain Block equal to the number of cards in your Discard Pile|}. It currently underperforms most alternatives, sitting at D tier in our Slay the Spire 2 card rankings.
Across 25 recorded runs, decks running it win 20.0% of the time, comfortably clear of the 13.9% average, by 6.0%. It’s a more selective pick, turning up in just 0.2% of decks that could run it. On average it shows up 1.0 times in the decks that take it.
It performs best next to Ascender's Bane — together they post a -4.0% swing in win rate. At 1 energy, it’s upgraded in 15.4% of runs and usually joins the deck around floor 8.
Upgraded, it gains +3 CalculationBase, which is why so many decks invest a rest-site upgrade in it. That’s 5 wins, 20 deaths, and 0 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Bowlbugs Normal, which closes out 8.0% of its appearances. Read on for Stack’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Event run.
Stack Win Rate & Pick Rate
Stack’s 20.0% win rate clears the 13.9% all-deck average by 6.0%, the gap charted below.
Run Outcomes with Stack
Stack has 5 wins and 20 losses over 25 tracked runs (20.0% won); abandoned runs count as losses.
- Wins 20.0%
- Losses 80.0%
When to Pick Up Stack
Stack is strongest when it joins the deck in Act 1, where runs win 20.0% across 25 runs — one of 1 recorded pickup windows.
Win rate of runs by the act Stack entered the deck. Acts that have not reached the sample floor show their run count only.
Best Cards to Pair with Stack
Ranked by win-rate lift, Stack performs best alongside Ascender's Bane (-4.0%).
Based on small co-occurring samples — treat these as early signals, not final verdicts.
Stack Card Details
Stack is an event skill costing 1 energy; it’s upgraded in 15.4% of runs and usually picked up by floor 8.
Gain Block equal to the number of cards in your Discard Pile|}.
Upgrade: +3 CalculationBase
What Ends Runs with Stack
Stack’s most common run-enders are Bowlbugs Normal (8.0%), Entomancer Elite (8.0%), and Knowledge Demon Boss (8.0%).
- Bowlbugs Normal8.0% of runs
- Entomancer Elite8.0% of runs
- Knowledge Demon Boss8.0% of runs
- Waterfall Giant Boss8.0% of runs
Get the Winning Edge
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- In-game overlays
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- Desktop-exclusive tools
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Stack – Frequently Asked Questions
Is Stack good in Slay the Spire 2?
Across 25 tracked runs, Stack has a 20.0% win rate — +6.0% above the average deck. Win rate reflects how often runs that include the card end in victory.
What does Stack do in Slay the Spire 2?
Stack costs 1 energy. Gain Block equal to the number of cards in your Discard Pile|}.
What class is Stack in Slay the Spire 2?
Stack is an Event Event Skill.
Is Stack worth upgrading in Slay the Spire 2?
Players upgrade Stack in 15.4% of runs. Upgrading it grants +3 CalculationBase.
See Also
Compare Stack with the rest of the best Slay the Spire 2 cards, relics, and classes below.