Aggression•Power

Is Aggression good in Slay the Spire 2?

Aggression is a rare Ironclad power in Slay the Spire 2. In combat it resolves as: At the start of your turn, put a random Attack from your Discard Pile into your Hand and Upgrade it. It ranks among the strongest cards its class can draft right now, earning a spot at B tier in our Slay the Spire 2 card tier list.

Across 40 recorded runs, decks running it win 39.5% of the time, comfortably clear of the 18.9% average, by 20.5%. It’s a more selective pick, turning up in just 1.1% of decks that could run it. Ironclad players keep it in 5.4% 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 Iron Wave — together they post a +14.8% swing in win rate. It also has strong chemistry with the relic Happy Flower, which moves its win rate by +20.3%. At 1 energy, it’s upgraded in 52.4% of runs and usually joins the deck around floor 14.

That’s 15 wins, 23 deaths, and 2 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Entomancer Elite, which closes out 7.5% of its appearances. Read on for Aggression’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Ironclad run.

Best Cards to Pair with Aggression

Ranked by win-rate lift, Aggression performs best alongside Iron Wave (+14.8%), Sword Boomerang (+13.5%), and Pact's End (+13.5%).

Iron Wave+14.8%13 runsSword Boomerang+13.5%6 runsPact's End+13.5%5 runsHemokinesis+13.5%6 runsExpect a Fight+13.2%7 runsJuggling+13.2%7 runs

Based on small co-occurring samples — treat these as early signals, not final verdicts.

Aggression Win Rate by Class

Aggression is played across 2 classes, led by Ironclad (41.7%) and Silent (0.0%) by win rate.

The Ironclad41.7%38 runsThe Silent0.0%2 runs

Best Relics for Aggression

Aggression pairs best with the relics Happy Flower (+20.3%), Meal Ticket (+20.2%), and Centennial Puzzle (+19.0%), ranked by win-rate lift.

Happy Flower+20.3%10 runsMeal Ticket+20.2%5 runsCentennial Puzzle+19.0%7 runsMeat on the Bone+17.3%4 runsVenerable Tea Set+17.3%4 runsBag of Marbles+16.4%6 runs

Based on small co-occurring samples — treat these as early signals, not final verdicts.

Aggression Card Details

Aggression is a rare power costing 1 energy; it’s upgraded in 52.4% of runs and usually picked up by floor 14.

At the start of your turn, put a random Attack from your Discard Pile into your Hand and Upgrade it.

What Ends Runs with Aggression

Aggression’s most common run-enders are Entomancer Elite (7.5%), Queen Boss (7.5%), and The Insatiable Boss (5.0%).

• Entomancer Elite7.5% of runs
• Queen Boss7.5% of runs
• The Insatiable Boss5.0% of runs
• Knowledge Demon Boss5.0% of runs
• Mytes Normal5.0% of runs

See Also

Compare Aggression with the rest of the best Slay the Spire 2 cards, relics, and classes below.