Hades, Lord of the underworld

Indestructible, Deathtouch
Hades, Lord of the underworld can't attack unless you have 15 or more soul counters
Whenever a creature dies, you gain a soul counter
{b}, remove X soul counters from yourself, {t}: target a creature in a graveyard with a converted mana cost half of X (rounded up), return that creature to the battlefield under your control