Darth Vader

Trample
Whenever Darth Vader enters the battlefield,
destroy target creature.
Whenever Darth Vader deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the
rest into their graveyard. You may look at and cast
that card for as long as it remains exiled, and you
may spend mana as though it were mana of any
type to cast that spell.