Razka

Oh and since you got white mana, armadillo cloaks would basically overkill the opponent.

Really nice. I'd put a pair of Eladamri's Call or Green Sun's Zenith to get the wurms. Verduran Enchantress would be nice too.
I'd lower your mana sources as well. You really end up having tons of mana that you'd probably not use.
Replace them with aspect of moongose to protect wurms from Terrors and alikes.

Added shifting slivers that sounds awesome and lotus petal, thx.
Removed sliver overlord, which wasn't that great actually.

Radiant? She's heavily clothed but she's a bombshell.