Gunk Up•Attack

Is Gunk Up good in Slay the Spire 2?

In Slay the Spire 2, Gunk Up is a common attack from the Defect card pool. Its effect: Deal 4 damage times. Add a Slimed into your Discard Pile. The data flags it as a weaker pick, settling at F tier — usually one to pass on unless your deck specifically wants it.

Over 90 tracked runs its win rate sits at 14.7%, 4.3% short of the 18.9% all-deck baseline. It sees niche play, included in only 2.4% of eligible runs. Within Defect runs it’s drafted 15.4% of the time, making it a regular part of that class’s decks. Decks that include it run about 1.4 copies on average.

Its standout pairing so far is Machine Learning, which lifts its win rate by +22.7% when the two share a deck. On the relic side, Tiny Mailbox is its standout companion, worth a +21.8% win-rate swing alongside it. It costs 1 energy, gets upgraded 28.2% of the time, and tends to be picked up near floor 11.

Upgrading the card adds +1 Damage to its stat line. Of the runs that drafted it, 11 ended in victory against 64 deaths and 15 abandons. Its most common run-ender is Queen Boss, finishing 11.1% of the runs it shows up in. See the synergies, class split, and threats below for the full picture of where Gunk Up fits a Defect deck.

Best Cards to Pair with Gunk Up

Gunk Up’s strongest card pairings so far are Machine Learning (+22.7%), Flak Cannon (+19.3%), and Skim (+17.7%), each shown with the win-rate lift it adds.

Machine Learning+22.7%11 runsFlak Cannon+19.3%12 runsSkim+17.7%11 runsShadow Shield+17.5%8 runsModded+15.7%9 runsIce Lance+14.2%3 runs

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

Gunk Up Win Rate by Class

Exclusive to the Defect, Gunk Up posts a 14.7% win rate over 90 tracked runs.

The Defectappears in 15.4% of its runs (90 tracked)

Best Relics for Gunk Up

The relics that swing Gunk Up’s win rate the most are Tiny Mailbox (+21.8%), Sword of Jade (+19.7%), and Lantern (+19.5%), with each lift shown.

Tiny Mailbox+21.8%5 runsSword of Jade+19.7%3 runsLantern+19.5%6 runsBlood Vial+17.7%11 runsPrayer Wheel+17.2%4 runsCandelabra+14.1%9 runs

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

Gunk Up Card Details

A 1-energy common attack, Gunk Up is upgraded 28.2% of the time and tends to enter the deck around floor 11.

Deal 4 damage times. Add a Slimed into your Discard Pile.

Upgrade: +1 Damage

What Ends Runs with Gunk Up

Runs holding Gunk Up end most often against Queen Boss (11.1%), Knowledge Demon Boss (5.6%), and The Insatiable Boss (5.6%) — the share of its runs each accounts for is shown.

• Queen Boss11.1% of runs
• Knowledge Demon Boss5.6% of runs
• The Insatiable Boss5.6% of runs
• Kaiser Crab Boss4.4% of runs
• Test Subject Boss4.4% of runs

See Also

Keep exploring Slay the Spire 2 tier lists and stats below.