Katy, Combo Player Hater

Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever an opponent casts or copies a noncreature spell they lose 1 life and you gain 1 life.
Whenever an opponent draws a card other than their first card that turn they lose 1 life.