Luna

Haste
Steal the toys: When Luna enters the battlefield,
look at the top four cards of target opponent's
library, exile one of them face down, then put
the rest on the bottom of that library in any
order. For as long as that card remains exiled,
you may cast it, and you may spend mana as
though it were mana of any type to cast it.
"Life is either a daring adventure or nothing."