Grand Arbiter Augustin IV is a rare Legendary Creature — Human Advisor card from Modern Masters (MMA), collector number 176. Current market price: $18.50 (foil $24.98), TCGplayer market prices via Scryfall.
White spells you cast cost {1} less to cast. Blue spells you cast cost {1} less to cast. Spells your opponents cast cost {1} more to cast.