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Rules Text

Kicker "Blue" <i>(You may pay an additional "Blue" as you cast this spell.)</i>

As Monstrous War-Leech enters the battlefield, if it was kicked, mill four cards. <i>(To mill a card, put the top card of your library into your graveyard.)</i>

Monstrous War-Leech’s power and toughness are each equal to the highest mana value among cards in your graveyard.