When you would pay life for an effect, instead exile that many cards from your library
2015-11-04 If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions
Necrotic Fumes, Academic Probation, and Containment Breach saw some play alongside Learn cards like Sparring Regimen and Eyetwitch, but there was one pairing that saw a lot of play: Divide by Zero and Mascot Exhibition
By the way, isnt it amusing that many of the classic horror movies came out in 1931
3 Add: Six Cut: Necropolis Fiend A powerful pre-planeswalker creature, Six is a Treefolk that lines up perfectly with Kotis in terms of abilities
The best part of them though, is that your Creature spells cost one generic mana less to cast for each point of life your opponents have lost this turn