Gaddock Teeg is a rare Legendary Creature — Kithkin Advisor card from Lorwyn (LRW), collector number 248. Current market price: $3.77 (foil $20.45), 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.