Gaddock Teeg is a rare Legendary Creature — Kithkin Advisor card from Ultimate Masters (UMA), collector number 199. Current market price: $2.28 (foil $5.18), TCGplayer market prices via Scryfall.
Noncreature spells with mana value 4 or greater can't be cast. Noncreature spells with {X} in their mana costs can't be cast.