Catacomb Dragon 


Creature — Dragon
Flying
Whenever this creature becomes blocked by a nonartifact, non-Dragon creature, that creature gets -X/-0 until end of turn, where X is half the creature's power, rounded down.
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Cards that do something similar expected a card that isn't here?
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Tragic Trajectory 81%
$0.21#13349
"That creature gets -10/-10 until end of turn instead if a nonland permanent left the battlefield this turn or a spell was warped this turn."
Blind Creeper 81%
$0.05#30832
"Whenever a player casts a spell, this creature gets -1/-1 until end of turn."