Midra, Lord of Frenzied Flame

Myriad

Sacrifice a nontoken nonland permanent: Midra gains +X/+X until end of turn, where X is that permanent's mana value. If X is 6 or above, Midra gains annihilator 1. Activate this ability only on your turn, and only once per turn.

When a ability or spell lets you return a card from your graveyard, you may instead target an opponents graveyard.