Jackdaw, Smokewalker

When Jackdaw, Smokewalker enters the battlefield, surveil 2.
Whenever Jackdaw, Smokewalker 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.