That's a pretty interesting alternate win condition, Olaf. It's not all that different from Test of Endurance, but it's very simple and clean.Coincidentally, I recently wrote a few thoughts on alternate win conditions on my blog at www.infinitegyre.com. (Or probably not so coincidentally, as we were both likely influenced by the Goblin Artisans design contest.)
I just read your article, and I'm kind of flattered that you didn't rip apart my design. This card was my submission to that contest, by the way.
I would love to throw that card in my mono-black Maga, Traitor to Mortals deck! I run Exquisite Blood, so the 30 life would be meaningless. I'd just have to hope the enchantment last until my next turn. Awesome card!
The nice thing about black is that life gain is attached to a lot of cards.