Marvo, Deep Operative

Whenever Marvo, Deep Opereative 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.