Rattle Attack

Is Rattle good in Slay the Spire 2?

Rattle is an uncommon Necrobinder attack in Slay the Spire 2. In combat it resolves as: Osty deals 7 damage. Hits an additional time for each other time he has attacked this turn. It’s a dependable, middle-of-the-pack option, landing at C tier in our rankings.

Across 318 recorded runs, decks running it win 27.2% of the time, comfortably clear of the 13.8% average, by 13.4%. It’s a more selective pick, turning up in just 1.5% of decks that could run it. Offer data is close to a wash — 17.9% of offers taken, 26.9% for runs that picked it against 27.0% for runs that skipped, a pick lift of just -0.1% over 249 decided runs. Necrobinder players keep it in 8.8% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.2 times in the decks that take it.

It performs best next to Seance — together they post a +25.4% swing in win rate. It also has strong chemistry with the relic Bone Flute, which moves its win rate by +28.9%. At 1 energy, it’s upgraded in 33.2% of runs and usually joins the deck around floor 15.

Upgraded, it gains +2 OstyDamage, which is why so many decks invest a rest-site upgrade in it. That’s 86 wins, 230 deaths, and 2 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Kaiser Crab Boss, which closes out 5.3% of its appearances. Read on for Rattle’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Necrobinder run.

Pick or Skip: Rattle

Out of 1560 recorded offers Rattle is taken 17.9% of the time, and taking it is worth -0.1% in pick lift — 26.9% for runs that picked it against 27.0% for runs that skipped, across 249 decided runs.

Taken 280 times out of 1560 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 Rattle

Rattle is strongest when it joins the deck in Act 3, where runs win 67.7% across 34 runs — one of 3 recorded pickup windows.

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

Best Cards to Pair with Rattle

Ranked by win-rate lift, Rattle performs best alongside Seance (+25.4%), Legion of Bone (+23.5%), and Call of the Void (+23.3%).

Seance+25.4%18 runsLegion of Bone+23.5%21 runsCall of the Void+23.3%37 runsMad Science+20.3%21 runsDelay+19.6%45 runsDemesne+19.0%50 runs

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

Rattle Win Rate by Class

Rattle is drafted only by the Necrobinder, where it holds a 27.2% win rate across 318 runs.

The Necrobinderappears in 8.8% of its runs (318 tracked)

Best Relics for Rattle

Rattle pairs best with the relics Bone Flute (+28.9%), Ornamental Fan (+26.3%), and Pendulum (+25.9%), ranked by win-rate lift.

Bone Flute+28.9%43 runsOrnamental Fan+26.3%25 runsPendulum+25.9%46 runsGambling Chip+25.6%16 runsHappy Flower+25.5%55 runsBag of Preparation+24.1%47 runs

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

Rattle Card Details

Rattle is an uncommon attack costing 1 energy; it’s upgraded in 33.2% of runs and usually picked up by floor 15.

Osty deals 7 damage. Hits an additional time for each other time he has attacked this turn.

Upgrade: +2 OstyDamage

What Ends Runs with Rattle

Rattle’s most common run-enders are Kaiser Crab Boss (5.3%), Aeonglass Boss (5.3%), and Decimillipede Elite (5.3%).

• Kaiser Crab Boss5.3% of runs
• Aeonglass Boss5.3% of runs
• Decimillipede Elite5.3% of runs
• Knowledge Demon Boss5.3% of runs
• Queen Boss3.8% of runs

See Also

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