Powers Versus Cards in Slay the Spire

Updated 2026-10-15T00:00:00.000Z Source Community mechanics documentation; exact figures to be verified against the game's own data By Antewise Editorial

Data status: This page explains mechanics and decision rules. Where a precise number matters we say so and mark it, rather than guessing.

Powers persist

A power card applies an effect that lasts the whole fight. You play it once and it keeps working.

That makes powers efficient: one energy now, value every turn after. The cost is a card slot spent upfront.

Cards are one-shot

Normal attack and skill cards do their job and leave. They are flexible but never compound on their own.

A deck of only one-shot cards must re-pay for the same effect each turn. That drains energy fast.

Mix the two

Powers set the engine; cards fire it. A strength power plus cheap attacks beats either alone.

Do not load up on powers with no way to act. You need cards to spend the energy the power frees.

Next: Why deck thinning wins.

Frequently asked questions

What is a power card?

A power gives a lasting effect for the rest of the combat. It leaves play after use but its bonus stays.

Should I pick powers over attacks?

Often, yes, if the power supports your plan. A good power pays off every turn, while one attack helps once.

Are powers worth taking in Slay the Spire?

A power pays off only if your deck can use it each turn. Take powers that fit your plan, not ones that sit dead in hand.

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