Well, with what is coming (what Jorael said) I can see where it can come in handy.
But other than that... I don't see much good of it. If from what KJ says is true about the black Epic card... some of these colors are getting the shaft, bad. If I can get the mana out, I can pretty well make it so that my enchantment deck kills if it can pull anything out of it each turn.
As for 5 dmg/5 lf... What the bloody heck is that? Sure you get a 5 for 5 trade-off, but you get the serious shaft when dealing with just about anything.
But of course, someone playing an Enduring Renewal with some of my decks would make me smile and try not to laugh. The card has the major drawback that your opponent can't defend themself with more than enchantments and what they already have down. In a multiplayer game... I dunno, probably paint someone as a big easy target.