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 restricts the player who played it from playing anymore spells for the rest of that game. The keyword was introduced in Saviors of Kamigawa and has appeared on the following five spells: Enduring Ideal (white), Eternal Dominion (blue), Neverending Torment (black) and Undying Flames (red), Endless Swarm (green). Template:Epic spells

Interactions

Here is a list of things an owner of a epic spell can do after an epic spell has been played and resolved.

He or she still has all phases; which means he or she will still untap, draw, attack, block, discard, etc.
He or she can still play lands; this is a game action that only requires the stack to be empty and the player to have priority.
He or she can use activated abilities on permanents of yours that are in play.
He or she can use abilities which work outside of the in-play zone. For example you can cycle cards as this isn't playing spells. (Some cycling actually triggers some abilties on the cycled card, e.g. when Decree of Pain is cycled, all creatures get -2/-2 until end of turn.)
He or she can put a copy of spell on the stack (e.g. Chain Lightning).

From the ()

Further references may be found in the Comprehensive Rules.