Xenagos Ascended is a common Legendary Enchantment Creature — God card from Defeat a God (TDAG), collector number 1. Current market price: $5.00, TCGplayer market prices via Scryfall.
Xenagos Ascended can't leave the battlefield as long as a Reveler is on the battlefield. When Xenagos Ascended leaves the battlefield, each player wins the game.