Aperantos, the Creator

Eminence —As long as Aperantos, the Creator is
in the command zone or on the battlefield, if you
cast another spell with a converted mana cost
four or more, you may put a permanent from
your graveyard into play until the end step then
exile it.
Defender, flying, lifelink, shroud
At the beginning of your upkeep, choose a card
at random in exile. If it's a creature card, put it
into your hand. Otherwise, shuffle it in your
library.