I don't know how helpful this will be for most white decks, but I like it for group hug.
I would totally play this as a second win condition in my
Kynaios and Tiro deck if I thought I could consistently get a black permanent onto the battlefield. My best bet would probably be nonblack cards that make black Zombie tokens, but then I'm playing those cards purely for this, which seems less than ideal. I guess I'll just stick to
Approach of the Second Sun.
Edit: Also, even without that challenge, this is just hard to pull off in multiplayer. Your opponents get a whole round to destroy something or reduce your life total below 40.