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 F tier — rarely a run-defining grab.

Over 241 tracked runs the win rate of decks holding it sits at 25.0%, 11.2% ahead of the 13.8% all-run baseline. It sees lighter play, carried in only 1.1% of runs. It does its best work in the hands of the Silent, who post a 31.8% win rate with it. Within Silent runs specifically, it’s carried 1.4% of the time.

Its standout card pairing is Backflip, which lifts the relic’s win rate by +41.7% when both are in play. It also works nicely with Mad Science, good for a +36.1% 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, 60 ended in victory while 180 fell to a defeat. Its most common run-ender is Knowledge Demon Boss, finishing 10.4% 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.

Pick or Skip: Sand Castle

Across 241 offers Sand Castle has a 100.0% pick rate; the 241 runs that took it and 0 that left it are still below the sample floor, so no win rate is shown.

Taken 241 times out of 241 offers.

A win rate is only shown once that side clears the sample floor. Below it you get the run counts and nothing else — a 0% here would be a reporting artefact, not a result.

Pick rate when offered counts offers, not runs: out of every time the game put this in front of a player, how often it was taken. It is not the same number as the share of runs that end up containing it.

Pick lift is the sample-adjusted gap between runs that took the option and runs that passed on it. It is the fair way to rank choices, because raw win rates put the smallest samples on top.

Best Cards with Sand Castle

The cards that gain the most from carrying Sand Castle are Backflip (+41.7%), Mad Science (+36.1%), and Finisher (+28.3%), each shown with its win-rate swing.

Backflip+41.7%18 runsMad Science+36.1%18 runsFinisher+28.3%15 runsEscape Plan+27.9%17 runsBlade Dance+23.1%27 runsAccuracy+22.6%21 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 Silent (31.8%), Necrobinder (28.6%), and Defect (24.5%).

The Silent31.8%66 runsThe Necrobinder28.6%35 runsThe Defect24.5%53 runsThe Regent22.2%36 runsThe Ironclad16.0%51 runs

Sand Castle Details

Carried in 1.1% 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 Knowledge Demon Boss (10.4%), Test Subject Boss (8.7%), and The Insatiable Boss (7.1%) — the share of its runs each accounts for is shown.

• Knowledge Demon Boss10.4% of runs
• Test Subject Boss8.7% of runs
• The Insatiable Boss7.1% of runs
• Decimillipede Elite6.6% of runs
• Kaiser Crab Boss5.8% of runs

See Also

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