Blind Obedience 57 (Commander 2017)

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.) Artifacts and creatures your opponents control enter tapped.

NM - $10.70
LP - $8.50
MP - $6.40
HP - $4.30
DMG - $2.20