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’s a dependable, middle-of-the-pack option, landing at C tier in our rankings.

Across 353 recorded runs, decks running it win 30.1% of the time, comfortably clear of the 14.3% average, by 15.8%. It’s a more selective pick, turning up in just 1.3% of decks that could run it. Taken in 26.7% of its offers, it still trails on the pick-versus-skip split: 30.4% for runs that took it against 34.6% for runs that left it, a -4.1% pick lift over 283 decided runs. Ironclad players keep it in 5.6% 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 Brand — together they post a +25.5% swing in win rate. It also has strong chemistry with the relic Royal Stamp, which moves its win rate by +27.6%. At 1 energy, it’s upgraded in 36.1% of runs and usually joins the deck around floor 17.

That’s 105 wins, 244 deaths, and 4 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Test Subject Boss, which closes out 5.4% 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.

Pick or Skip: Aggression

Out of 1111 recorded offers Aggression is taken 26.7% of the time, and taking it is worth -4.1% in pick lift — 30.4% for runs that picked it against 34.6% for runs that skipped, across 283 decided runs.

Taken 297 times out of 1111 offers.

Pick rate when offered counts offers, not runs: out of every time the game put this in front of a player, how often it was taken. It is not the same number as the share of runs that end up containing it.

Pick lift is the sample-adjusted gap between runs that took the option and runs that passed on it. It is the fair way to rank choices, because raw win rates put the smallest samples on top.

When to Pick Up Aggression

Aggression is strongest when it joins the deck in Act 3, where runs win 50.0% across 16 runs — one of 4 recorded pickup windows.

Win rate of runs by the act Aggression entered the deck. Acts that have not reached the sample floor show their run count only.

Best Cards to Pair with Aggression

Ranked by win-rate lift, Aggression performs best alongside Brand (+25.5%), Mad Science (+24.1%), and Ultimate Defend (+21.7%).

Brand+25.5%26 runsMad Science+24.1%38 runsUltimate Defend+21.7%19 runsUltimate Strike+19.9%18 runsPact's End+18.9%39 runsDrum of Battle+18.5%25 runs

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

Aggression Win Rate by Class

Aggression is drafted only by the Ironclad, where it holds a 30.1% win rate across 329 runs.

The Ironcladappears in 5.6% of its runs (329 tracked)

Best Relics for Aggression

Aggression pairs best with the relics Royal Stamp (+27.6%), Unsettling Lamp (+23.3%), and Oddly Smooth Stone (+23.2%), ranked by win-rate lift.

Royal Stamp+27.6%16 runsUnsettling Lamp+23.3%20 runsOddly Smooth Stone+23.2%67 runsCentennial Puzzle+23.1%55 runsHappy Flower+22.9%73 runsHorn Cleat+22.3%32 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 36.1% of runs and usually picked up by floor 17.

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 Test Subject Boss (5.4%), Queen Boss (5.4%), and Decimillipede Elite (5.1%).

• Test Subject Boss5.4% of runs
• Queen Boss5.4% of runs
• Decimillipede Elite5.1% of runs
• The Insatiable Boss4.8% of runs
• Kaiser Crab Boss4.0% of runs

See Also

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