Seascape Aerialist {4}{U}
Creature — Merfolk Wizard Ally
Whenever this creature or another Ally you control enters, you may have Ally creatures you control gain flying until end of turn.
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Cards that do something similar expected a card that isn't here?
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Archon of Redemption 81%
$0.26#14577
"Whenever this creature or another creature you control with flying enters, you may gain life equal to that creature's power."