http://gatherer.wizards.com/Handlers...3939&type=card
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Both decks have horrible manabases and not much else going on aside from "amass beaters and hope for the best". Having 8 ways to flash in creatures instead of just 4 with Vial should also be very relevant in a metagame where Miracles shits on everything as uncounterable "haste" threats are one of the very few things that hurts it.
There are alot of spirits with utility. I wouldn't categorically rule out the possibility that there might be a Legacy-playable Spirit deck if built right, but there's a myriad ways to build said deck. Just don't expect it to be instant Tier 1 like Eldrazi.
I'm going to open a thread for brainstorming. Edit: Link