The Golgari Swarm is upon us...
As a general I can see him ultimately becoming boring, as his implied strategy is rather linear, while his ability to simply kill an entire table of opponents in one big turn will make him feel like a combo deck, even if you never actually "combo off" - He really resembles Exsanguinate more than anything, I think.
That said, as a win-con in the 99, I think he's less likely to warp the deck around him in a linear fashion.
Most of the time he'll just be an irrelevant creature, or an overcosted pump spell.
I'd cringe havin to play this even in Limited. 3/3 Flyers are prized in draft, but I have a hard time getting excited over a 6-mana creature that isn't a bomb. At least the Scavenge cost on this is much more reasonable than some we've seen.
Definitely not EDH material.
My advise: Trade these to Standard players for lots and lots of EDH playables. Because that CMC restriction severely hampers it's EDH playability. Sure it can destry Swords of Stuff and Junk or Serra Ascendants, but so does Putrefy, which isn't worth $25.00 and is much more versatile.
See also: Beast Within, Bramblecrush, etc...
Forget Scavenge dudes. THIS is the guy you want helping out your Ghave deck. Powers the hell out of Gavony Township, Avenger of Zendikar, and even Mikaeus the Lunarch. But you already knew that.
Oh he also looks like solid gold in Skullbriar.
I honestly can't think of any other relevant applications beyond those two super-obvious ones. Any ideas?
I might play this guy in a aggresive Skullbriar deck with lots of removal and Swords. Mostly, though, he's just sorta "meh".