Professor Onyx 153 (Commander: Duskmourn: House of Horror)

Magecraft — Whenever you cast or copy an instant or sorcery spell, each opponent loses 2 life and you gain 2 life. +1: You lose 1 life. Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard. −3: Each opponent sacrifices a creature with the greatest power among creatures that player controls. −8: Each opponent may discard a card. If they don't, they lose 3 life. Repeat this process six more times.

NM - $10.74
LP - $8.59
MP - $6.45
HP - $4.29
DMG - $2.15