Tzeentch, Architect of Fate

Indestructible
All cards milled are exiled by Tzeentch rather
than put into the graveyard.
If you attempt to draw a card from your library
while it has no cards in it, you do not lose the
game, and instead cast one card exiled by
Tzeentch without paying it's mana cost.
{u/b}{u/b}{t}: Flip a coin. Heads, each player mills
9. Tails, each opponent may cast one card
exiled by Tzeentch for free.