Syndic of Tithes is a common Creature — Human Cleric card from Gatecrash (GTC), collector number 26. Current market price: $0.23 (foil $0.89), TCGplayer market prices via Scryfall.
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.)