Nautical Monstrosity

When you cast this spell, exile up to three nonland permanents. Nautical Monstrosity cannot be exiled or destroyed, shroud. Nautical Monstrosity has power and toughness equal to combined mana cost of each card in exile. Devour - {0}: Exile the top 7 cards of each player’s library. Activate only once each turn. Can block any number of creatures. During the blockers phase, you control defending opponent.