FTL•Attack

Is FTL good in Slay the Spire 2?

FTL is an uncommon Defect attack in Slay the Spire 2. In combat it resolves as: Deal 5 damage. If you have played fewer than cards this turn, draw 1 card. It’s a dependable, middle-of-the-pack option, landing at C tier in our rankings.

Across 94 recorded runs, decks running it win 29.3% of the time, comfortably clear of the 18.9% average, by 10.3%. It’s a more selective pick, turning up in just 2.5% of decks that could run it. Defect players keep it in 16.1% 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 Supercritical — together they post a +23.0% swing in win rate. It also has strong chemistry with the relic Tiny Mailbox, which moves its win rate by +25.4%. At 0 energy, it’s upgraded in 13.5% of runs and usually joins the deck around floor 17.

Upgraded, it gains +1 Damage, which is why so many decks invest a rest-site upgrade in it. That’s 24 wins, 58 deaths, and 12 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Test Subject Boss, which closes out 7.4% of its appearances. Read on for FTL’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Defect run.

Best Cards to Pair with FTL

Ranked by win-rate lift, FTL performs best alongside Supercritical (+23.0%), Skim (+20.4%), and Machine Learning (+17.7%).

Supercritical+23.0%9 runsSkim+20.4%10 runsMachine Learning+17.7%9 runsProduction+16.3%3 runsSunder+14.8%8 runsGenetic Algorithm+14.8%9 runs

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

FTL Win Rate by Class

FTL is drafted only by the Defect, where it holds a 29.3% win rate across 94 runs.

The Defectappears in 16.1% of its runs (94 tracked)

Best Relics for FTL

FTL pairs best with the relics Tiny Mailbox (+25.4%), Potion Belt (+22.4%), and Dragon Fruit (+20.2%), ranked by win-rate lift.

Tiny Mailbox+25.4%10 runsPotion Belt+22.4%17 runsDragon Fruit+20.2%4 runsJoss Paper+20.2%4 runsAnchor+18.0%12 runsPunch Dagger+16.3%3 runs

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

FTL Card Details

FTL is an uncommon attack costing 0 energy; it’s upgraded in 13.5% of runs and usually picked up by floor 17.

Deal 5 damage. If you have played fewer than cards this turn, draw 1 card.

Upgrade: +1 Damage

What Ends Runs with FTL

FTL’s most common run-enders are Test Subject Boss (7.4%), The Insatiable Boss (5.3%), and Queen Boss (4.3%).

• Test Subject Boss7.4% of runs
• The Insatiable Boss5.3% of runs
• Queen Boss4.3% of runs
• Entomancer Elite4.3% of runs
• The Kin Boss4.3% of runs

See Also

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