Selfless Cathar 
Creature — Human Cleric
{1}{W}, Sacrifice this creature: Creatures you control get +1/+1 until end of turn.
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Cards that do something similar expected a card that isn't here?
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Encampment Keeper 91%
$0.13#22348
"{7}{W}, {T}, Sacrifice this creature: Creatures you control get +2/+2 until end of turn."