Bog Gnarr {4}{G}
Creature — Beast
Whenever a player casts a black spell, this creature gets +2/+2 until end of turn.
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Cards that do something similar expected a card that isn't here?
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Glade Gnarr 86%
$0.10#31181
"Whenever a player casts a blue spell, this creature gets +2/+2 until end of turn."