Epic

Epic is a keyword ability that changes the rules for playing spells for the player that plays the epic spell. When an epic spell resolves, it prevents the player who played it from playing anymore spells for the rest of that game. The keyword was introduced in Betrayers of Kamigawa and has appeared on the following five spells: Endless Swarm, Enduring Ideal, Eternal Dominion, Neverending Torment and Undying Flames.

From the Comprehensive Rules:

• 502.44. Epic
  • 502.44a Epic represents both a static ability and a delayed triggered ability. “Epic” means, “For the rest of the game, you can’t play spells,” and “At the beginning of each of your upkeeps, copy this spell except for its epic ability. If the spell has any targets, you may choose new targets for the copy.” See rule 503.10.
  • 502.44b A player can’t play spells once a spell with epic he or she controls resolves, but effects (such as the epic ability itself) can still put copies of spells onto the stack.