Gaddock Teeg is a rare Legendary Creature — Kithkin Advisor card from The List (PLST), collector number UMA-199. Current market price: $0.63, 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.