Hydromorph Guardian 

Creature — Elemental
{U}, Sacrifice this creature: Counter target spell that targets a creature you control.
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Cards that do something similar expected a card that isn't here?
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Hydromorph Gull 100%
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"{U}, Sacrifice this creature: Counter target spell that targets a creature you control."
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"{U}, Sacrifice this creature: Counter target noncreature spell."
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"{U}, Sacrifice this creature: Counter target spell unless its controller pays {2}."