Thanks for the feedback, Artos. I've made some revisions:
-Glorious Anthem
-Gaea's Anthem
-Phantom Nantuko
-Fleetfoot Panther
-Nature's Lore
-Essence Warden
-Wispmare
-2x Plains
+Eternal Witness
+Solemn Simulacrum
+Yavimaya Elder
+Karmic Guide
+Stonecloaker
+Spike Weaver
+Akroma's Vengeance
+Gaea's Blessing
+Sungrass Prairie (down to 37 land)
Some of these are cards I just got in the mail. Still trying to get a Kodama's Reach, Fracturing Gust, Blasting Station.
I've decided to stick with Stomphowler over Pridemage for now. I have less GY recursion than I do "blink" effects; I think I get more mileage out of the 'comes-into-play' than I do the '1,sac:'. The synergy the Pridemage has with Reveillark is nice, but I have found that I am never lacking for Rev. targets. (And the Stomphowler has a way cooler name, all else the same.

)
I dropped the Anthems because all they did was make people do their combat math differently; they have literally never helped me win a game. The Nantuko was an underwhelming creature in the deck. Great for defense, but most of the time I'm getting attacked it's by flying creatures, shadow creatures, fear creatures, or pro-green/white creatures, in which case he's not really a good defender at all. The Panther came out for Stonecloaker. I agree with your comments here, Artos. I also realized I can't bounce Simulacrum, Duplicant, or Triskelion with the Panther since he specifies that the creature must be G or W. Nature's Lore came out because I don't find myself needing the fixing or the acceleration that much. It's presence in the deck is leftover from the deck's beginnings, when it didn't have as solid a manabase. Essence Warden usually gains me about 6-8 life before someone eats its face. In comparison to the power level of some of the cards I wanted to include, it was lacking. I also like to shy away from one-drops, as those impulsive, aggro players tend to rush at the player who does something first

. The Wispmare decision was agonizing, and I'm still not certain if it was the right thing to cut. We'll see!
PS: Last night I played against my friend's newly constructed U/W Sygg deck (which, granted, is not very strong). I swear I did 20 damage with Triskelion that game. Sac Saffi, targeting Triskelion. He shoots for two, then kills himself to come back in and shoot for three more. Spike Weaver shifts counters onto to him for 2 more points. I bounce him with Whitemane Lion, and then later with Stonecloaker. Karmic Guide, getting Triskelion back <opponent wraths here>. Hymn of Rebirth, targetting Karmic Guide, which gets Triskelion back. To summarize: awesome!