Historical Rules · 16 July 2010
Rule 702.47a
Official source text from the 16 July 2010 Rules release
Epic represents two spell abilities, one of which creates a delayed triggered ability. "Epic" means "For the rest of the game, you can't cast spells," and "At the beginning of each of your upkeeps for the rest of the game, copy this spell except for its epic ability. If the spell has any targets, you may choose new targets for the copy." See rule 706.9.