Timberwatch Elf {2}{G}
Creature — Elf
{T}: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.
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Cards that do something similar expected a card that isn't here?
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Traveling Minister 82%
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"{T}: Target creature gets +1/+1 until end of turn. When that creature leaves the battlefield this turn, sacrifice this creature. Activate only during combat and only if defending player controls no snow lands."
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"{T}: Target creature gets +X/+X until end of turn, where X is this creature's power."
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"{T}: Target creature gets +0/+2 until end of turn. Activate only during your turn, before attackers are declared."