Zotreh, Undeath Unrelenting

Whenever you gain life for the first time each
turn, mill two cards.
Whenever you return a creature card from your
graveyard to your hand, you may pay life equal
to it's mana cost. If you do, put it into the
battlefield instead. It gains decayed.
{x}, {t}: Exile X cards from any graveyard. Gain 1
life for each creature card exiled this way.