Monstrous War-Leech
From Dominaria United set
Monstrous War-Leech
Creature — Leech Horror
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Kicker
(You may pay an additional
as you cast this spell.)
As this creature enters, if it was kicked, mill four cards. (To mill a card, put the top card of your library into your graveyard.)
Monstrous War-Leech's power and toughness are each equal to the highest mana value among cards in your graveyard.