Ceasless Purging

Put two 4/4 white Angel creature tokens with flying and vigilance onto the battlefield. Until end of turn, whenever any number of angels you control attack, exile target nonland permanent.
Epic (For the rest of the game, you can't cast spells. At the beginning of each of your upkeeps, copy this spell except for its epic ability. You may choose new targets for the copy)
"Not until every last unworthy soul has been vanquished."