Name:Knight of Obligation
ManaCost:3 W
Types:Creature Human Knight
PT:2/4
K:Vigilance
K:Extort
SVar:Picture:http://www.wizards.com/global/images/magic/general/knight_of_obligation.jpg
Oracle:Vigilance\nExtort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)