You are right, I'm not in a position to proxy. The Elvish Spirit Guides sound a bit random, were they really working for you? Another problem would be to find slots for them.

I need Witness for the Triskelion kill, don't I? This wouldn't make it an option for me because Witness isn't good in unpowered decks as we discussed above. Memnarch sounds good though. I think I'll ad one to the SB or maybe even try it in the maindeck.

Edit: So far I removed 1 Tropical Island and 2 Bayous for another two basic Islands and one Swamp. This leaves me with three Tropical Islands as permanent green mana sources, I hope this won't cause any problems in casting the Xantid Swarms.