Ultimate Green Goblin is a rare Legendary Creature — Goblin Villain card from Through the Omenpaths (OM1), collector number 153.
At the beginning of your upkeep, discard a card, then create a Treasure token. Mayhem {2}{B/R} (You may cast this card from your graveyard for {2}{B/R} if you discarded it this turn. Timing rules still apply.)