Avatar of Might {6}{G}{G}
Creature — Avatar
If an opponent controls at least four more creatures than you, this spell costs {6} less to cast.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
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Cards that do something similar expected a card that isn't here?
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Lashwhip Predator 89%
$0.09#19106
"This spell costs {2} less to cast if your opponents control three or more creatures."