flavorText: He can calculate interest to six decimal places even in the midst of a deadly duel.
name: Knight of Obligation
originalText: Vigilance\nExtort (Whenever you cast a spell, you may pay {WB}. If you do, each opponent loses 1 life and you gain that much life.)
printings: GTC
text: 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.)