Ela and Val, the Gates

Indestructible
As long as your devotion to white and black is
less than seven, Ela and Val isn't a creature.
Whenever Ela and Val attacks, defending player sacrifices a creature or enchantment.
{1}{w}{b}: Choose up to three cards in target player's
graveyard. For each of those cards, that player
loses 2 life unless they exile that card.