Antewise

Whistle — Event Attack Card in Slay the Spire 2

Updated 17 Oct 2026 Source Slay the Spire 2 card data (spire-codex.com API), 577 cards retrieved 17 October 2026 By
Data status: The facts on this page were checked against the source named above. Game values can still shift with a patch, so re-check anything that looks off.
Whistle card art
Whistle

Deal 33 damage. Stun the enemy.

CharacterEvent
TypeAttack
RarityAncient
Cost3 Energy
TargetAnyEnemy
Total damage33
Per Energy11.00 → 14.67 upgraded
KeywordsExhaust

Card text

Deal 33 damage. Stun the enemy.

Upgraded: Deal 44 damage. Stun the enemy.

Where it sits on the curve

Measured the same way as our efficiency tier list: total damage divided by Energy.

Whistle produces 11.00 per Energy at base and <strong>14.67</strong> upgraded. That ranks it 15 of 143 of the 143 attacks with a fixed cost. It sits in the top 90% on this measure.

The measure ignores everything that is not a number. Area damage, conditions and drawbacks are not priced in.

Other Event cards at 3 Energy

  • Relax — Gain 15 Block. Next turn, draw 2 cards and gain 2 Energy.

Other cards with Exhaust

Where to go next

All 577 cards — the full table, filterable by character. Efficiency tier list — every measurable card ranked.

Rarity system explains how often this card appears. Enchantments covers the modifiers that can change it.

Frequently asked questions

What does Whistle do in Slay the Spire 2?

Deal 33 damage. Stun the enemy.

What does upgrading Whistle change?

Deal 44 damage. Stun the enemy.

How much does Whistle cost?

3 Energy. It is a Ancient Attack card.

Is Whistle efficient for its cost?

It produces 11.00 damage per Energy, which ranks 15 of 143 among the attacks that can be measured this way.

More Slay the Spire 2 guides

Sources

Figures and item data on this site are read from the game’s own reference wiki before publishing. Where a value could not be confirmed there, the page says so instead of filling the gap.