Gruul Keyrune {3}
Artifact
{T}: Add {R} or {G}.
{R}{G}: This artifact becomes a 3/2 red and green Beast artifact creature with trample until end of turn.
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Cards that do something similar expected a card that isn't here?
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Gruul War Plow 81%
$5.36#14144
"{1}{R}{G}: This artifact becomes a 4/4 Juggernaut artifact creature until end of turn."