Kriktu, Hoarder of Souls

Kriktu's power and toughness are each equal to your life total.
If another nonland permanent card would be put into a graveyard from anywhere except exile, exile it instead.
{3}, Put three cards exiled with Kriktu into their owners' graveyards: Kriktu is indestructible this turn. Draw two cards.
When Kriktu leaves the battlefield, you lose the game.