Battlefield Thaumaturge is a rare Creature — Human Wizard card from Journey into Nyx (JOU), collector number 31. Current market price: $0.25 (foil $0.52), TCGplayer market prices via Scryfall.
Each instant and sorcery spell you cast costs {1} less to cast for each creature it targets. Heroic — Whenever you cast a spell that targets this creature, this creature gains hexproof until end of turn.