Knight of Obligation

Creature — Human Knight    (CMC:4)

Vigilance (Attacking doesn't cause this creature to tap.) Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)

He can calculate interest to six decimal places even in the midst of a deadly duel.

18 GTC • ENRyan Barger — watermark: Orzhov

™ & © 1993—2013 Wizards of the Coast

Legal in: Modern,Return to Ravnica Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Knight of Obligation {3}{W} Creature — Human Knight Vigilance (Attacking doesn't cause this creature to tap.) 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.) 2/4

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View this MTG card on Gatherer

4/15/2013
You may pay  a maximum of one time for each extort triggered ability. You decide whether to pay when the ability resolves.
4/15/2013
The amount of life you gain from extort is based on the total amount of life lost, not necessarily the number of opponents you have. For example, if your opponent's life total can't change (perhaps because that player controls Platinum Emperion), you won't gain any life.
4/15/2013
The extort ability doesn't target any player.

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