Foliate Head

At the beginning of your upkeep, you may
exile any number of creatures you control,
for each creature exiled this way you may
search your library for a creature card with
mana value equal to 1 plus that cards mana
value, you may cast the cards without paying
their mana cost. Shuffle all creature cards
exiled this way into their owners library.
And so the proces of rebirth continues.