Phobophobia

Whenever you cast a Curse spell, each opponent loses life equal to the number of Curses enchanting them.
At the beginning of your upkeep, search your library for up to one Aura Curse card, reveal it, put it in your hand, then shuffle your library.
"Fear begets more fear. My plague shall spread like glorious conflagration!"
-Ranshi, Vile Empath