Ragnarok

At the beginning of enchanted player's upkeep, that player sacrifices a creature of your choice. If the player can't, you may search your library for a Curse card that doesn't have the same name as a Curse attached to enchanted player, put it onto the battlefield attached to that player, then shuffle your library.
When enchanted player loses the game, Sacrifice Ragnarok: Create a legendary 20/20 blue/green serpent creature token with trample and indestructible named Jormungand.