Lord Of Buried Secrets

Mythical (you can only have one copy of this card, in
your deck and in the battlefield)
Lifelink, Menace, Indestructible
Whenever a player mills a card, If it is a creature,
exile it and create a 2/2 black skeleton, otherwise
put a +1/+1 counter on this creature.
{t}: Target player mills cards equal to the
amount of life you gained this turn.