Flash of Steel•Attack

Is Flash of Steel good in Slay the Spire 2?

Flash of Steel is an uncommon Colorless attack in Slay the Spire 2. In combat it resolves as: Deal 5 damage. Draw 1 card. 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 76 recorded runs, decks running it win 36.5% of the time, comfortably clear of the 18.9% average, by 17.6%. It’s a more selective pick, turning up in just 2.0% of decks that could run it. Ironclad players keep it in 2.7% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.0 times in the decks that take it.

It performs best next to Feed — together they post a +14.7% swing in win rate. It also has strong chemistry with the relic Arcane Scroll, which moves its win rate by +22.7%. At 0 energy, it’s upgraded in 10.3% of runs and usually joins the deck around floor 17.

Upgraded, it gains +3 Damage, which is why so many decks invest a rest-site upgrade in it. That’s 23 wins, 40 deaths, and 13 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Decimillipede Elite, which closes out 6.6% of its appearances. Read on for Flash of Steel’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Colorless run.

Best Cards to Pair with Flash of Steel

Ranked by win-rate lift, Flash of Steel performs best alongside Feed (+14.7%), Rage (+14.7%), and Footwork (+14.7%).

Feed+14.7%3 runsRage+14.7%5 runsFootwork+14.7%3 runsPyre+14.5%5 runsBreakthrough+14.5%5 runsAfterimage+14.5%5 runs

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

Flash of Steel Win Rate by Class

Flash of Steel is played across 5 classes, led by Ironclad (57.1%), Regent (44.4%), and Silent (33.3%) by win rate.

The Ironclad57.1%19 runsThe Regent44.4%11 runsThe Silent33.3%13 runsThe Defect28.6%17 runsThe Necrobinder21.4%16 runs

Best Relics for Flash of Steel

Flash of Steel pairs best with the relics Arcane Scroll (+22.7%), Potion Belt (+22.7%), and Mercury Hourglass (+22.7%), ranked by win-rate lift.

Arcane Scroll+22.7%8 runsPotion Belt+22.7%11 runsMercury Hourglass+22.7%10 runsVenerable Tea Set+19.0%12 runsThe Chosen Cheese+18.1%4 runsHappy Flower???+18.1%4 runs

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

Flash of Steel Card Details

Flash of Steel is an uncommon attack costing 0 energy; it’s upgraded in 10.3% of runs and usually picked up by floor 17.

Deal 5 damage. Draw 1 card.

Upgrade: +3 Damage

What Ends Runs with Flash of Steel

Flash of Steel’s most common run-enders are Decimillipede Elite (6.6%), Knowledge Demon Boss (5.3%), and Queen Boss (3.9%).

• Decimillipede Elite6.6% of runs
• Knowledge Demon Boss5.3% of runs
• Queen Boss3.9% of runs
• Knights Elite3.9% of runs
• Vantom Boss2.6% of runs

See Also

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