Kaorak, Harnesser of Souls

Kaorak's power and toughness are both equal
to the amount of creatures in all graveyards.
{6}, {t}: Fateseal X, where X is equal to the
amount of creatures in all graveyards.
If there are 30 or more creatures in all
graveyards, you win the game.
Even abandoned memories of the past can
fuel the future.