Sand Castle•Relic

Is Sand Castle good in Slay the Spire 2?

In Slay the Spire 2, Sand Castle is an ancient relic you can pick up on your climb. Its effect: Upon pickup, Upgrade random cards. The data marks it as a weaker relic, settling at D tier — rarely a run-defining grab.

Over 47 tracked runs the win rate of decks holding it sits at 33.3%, 14.4% ahead of the 18.9% all-run baseline. It sees lighter play, carried in only 1.2% of runs. It does its best work in the hands of the Defect, who post a 44.4% win rate with it. Within Defect runs specifically, it’s carried 1.7% of the time.

Its standout card pairing is Backstab, which lifts the relic’s win rate by +46.7% when both are in play. It also works nicely with Signal Boost, good for a +41.7% win-rate change. It typically enters the deck near floor 18. As an ancient relic, how often it’s offered depends on its rarity tier.

Of the runs that carried it, 14 ended in victory while 28 fell to a defeat. Its most common run-ender is Test Subject Boss, finishing 10.6% of the runs it appears in. See the best cards, class split, and threats below for the full read on whether Sand Castle is worth grabbing.

Best Cards with Sand Castle

The cards that gain the most from carrying Sand Castle are Backstab (+46.7%), Signal Boost (+41.7%), and Demon Form (+33.3%), each shown with its win-rate swing.

Backstab+46.7%5 runsSignal Boost+41.7%4 runsDemon Form+33.3%3 runsMayhem+33.3%3 runsNegative Pulse+33.3%3 runsAfterlife+33.3%3 runs

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

Sand Castle Win Rate by Class

Of the 5 classes that carry Sand Castle, it performs best with Defect (44.4%), Necrobinder (42.9%), and Silent (38.5%).

The Defect44.4%10 runsThe Necrobinder42.9%7 runsThe Silent38.5%14 runsThe Regent20.0%6 runsThe Ironclad12.5%10 runs

Sand Castle Details

Carried in 1.2% of runs, Sand Castle is an ancient relic typically acquired near floor 18.

Upon pickup, Upgrade random cards.

What Ends Runs with Sand Castle

Runs carrying Sand Castle end most often against Test Subject Boss (10.6%), Decimillipede Elite (10.6%), and Knowledge Demon Boss (8.5%) — the share of its runs each accounts for is shown.

• Test Subject Boss10.6% of runs
• Decimillipede Elite10.6% of runs
• Knowledge Demon Boss8.5% of runs
• Queen Boss6.4% of runs
• Entomancer Elite4.3% of runs

See Also

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