Infernal Phantom 

Creature — Spirit
Eerie — Whenever an enchantment you control enters and whenever you fully unlock a Room, this creature gets +2/+0 until end of turn.
When this creature dies, it deals damage equal to its power to any target.
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Cards that do something similar expected a card that isn't here?
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"When this creature dies, it deals damage equal to its power to any target."
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"When this creature dies, it deals damage equal to its power to any target."
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"When this creature dies, it deals damage equal to its power to any target."
Erratic Apparition 91%
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Ember-Fist Zubera 91%
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"When this creature dies, it deals damage to any target equal to the number of Zubera that died this turn."
Setessan Skirmisher 86%
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"Whenever an enchantment you control enters, this creature gets +1/+1 until end of turn."
Goblin Fireleaper 84%
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"When this creature dies, it deals damage equal to its power to target creature an opponent controls."
Flaming Tyrannosaurus 80%
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"When this creature dies, it deals damage equal to its power to each opponent."