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 currently underperforms most alternatives, sitting at F tier in our Slay the Spire 2 card rankings.

Across 67 recorded runs, decks running it win 18.3% of the time, right in line with the typical deck. It’s a more selective pick, turning up in just 1.8% of decks that could run it. Necrobinder players keep it in 8.1% 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 Sentry Mode — together they post a +21.9% swing in win rate. It also has strong chemistry with the relic Bone Flute, which moves its win rate by +27.2%. At 1 energy, it’s upgraded in 33.8% of runs and usually joins the deck around floor 12.

Upgraded, it gains +2 OstyDamage, which is why so many decks invest a rest-site upgrade in it. That’s 11 wins, 49 deaths, and 7 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Knowledge Demon Boss, which closes out 6.0% 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.

Best Cards to Pair with Rattle

Ranked by win-rate lift, Rattle performs best alongside Sentry Mode (+21.9%), Grave Warden (+21.0%), and Afterlife (+19.6%).

Sentry Mode+21.9%7 runsGrave Warden+21.0%16 runsAfterlife+19.6%11 runsShared Fate+18.1%6 runsCalcify+17.0%17 runsDirge+15.7%13 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 18.3% win rate across 67 runs.

The Necrobinderappears in 8.1% of its runs (67 tracked)

Best Relics for Rattle

Rattle pairs best with the relics Bone Flute (+27.2%), Festive Popper (+23.3%), and Pendulum (+19.6%), ranked by win-rate lift.

Bone Flute+27.2%5 runsFestive Popper+23.3%5 runsPendulum+19.6%9 runsJoss Paper+18.9%4 runsToxic Egg+18.9%3 runsCentennial Puzzle+16.2%5 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 33.8% of runs and usually picked up by floor 12.

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 Knowledge Demon Boss (6.0%), Kaiser Crab Boss (6.0%), and Vantom Boss (4.5%).

• Knowledge Demon Boss6.0% of runs
• Kaiser Crab Boss6.0% of runs
• Vantom Boss4.5% of runs
• Test Subject Boss4.5% of runs
• Terror Eel Elite4.5% of runs

See Also

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