Ashen one, Unkindled

Ashen one, Unkindled gets +X/+0, where X is the
greatest power among creature cards in all
graveyards.
Whenever Ashen one attacks, each player mills a
card.
During each of your turns, you may play a land and
cast a spell from among cards in graveyards that
were put there from libraries this turn.

[Coram, the Undertaker]