Knight of Obligation

Creature — Human Knight - (uncommon)

Vigilance
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.)

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

Price

cardkingdom 0.35

cardmarket 0.25

cardsphere 0.19

tcgplayer 1.63