I've been testing out this deck since I saw it place in germany a month or two back. The only real new development I see is the inclusion of Mirror Entity. I also thought about taking this route, for the infinite mana trick, but after testing it just didn't seem as consistent.

Instead, I went with good ole Killer Bees. It's not infinite, but with a Priest of Titania and a Survival you can chain into twenty + mana by turn four pretty consistently. Then cast a flying hasted 20/20 for lethal. (It also takes care of Tombstalker just fine). Using Bees instead of Mirror Entity provides the advantage of not having to splash for a tertiary color, and takes up less room. I can't definitively state it's the better choice, but I think it's a comparable choice.

I do like the list more than any Elf or Survival list. Hope to see more development on it in the future.