Grand Arbiter Augustin IV is a rare Legendary Creature — Human Advisor card from Dissension (DIS), collector number 112. Current market price: $18.70 (foil $76.56), 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.