Mind Eater

Trample, Islandwalk
Whenever Mind Eater deals combat damage to a player, exile the top five cards of their library.
For as long as those cards remain in exile, you
may cast those cards, and you may spend mana as though it were mana of any type to cast them.
"It swallows crews whole, then it releases them. But
they are never the same, only mindless shells of what
they were before"