Marvo, Deep Operative

Whenever Marvo, Deep Operative attacks, clash
with defending player. (Each clashing player reveals the top card of their library, then puts that card on the top or bottom. A player wins if their
card had a higher mana value.)

Whenever you win a clash, draw a card. Then you may cast a spell from your hand with mana value 8
or less without paying its mana cost.