Midra, Haunt of the Abyss

Wither

Whenever you cast an instant or sorcery, search your library for a Curse card with equal or lesser mana value and put it onto the battlefield enchanting you, then shuffle.

Midra, Haunt of the Abyss gets +X/+0, where X is the total mana value of Curses you control.

As long as Midra, Haunt of the Abyss’s power is 20 or greater, he has Fear.