It definitely clears up some questions that I had about Swifthawk Agents, even if I'm really not a fan of the answer. I have plans to proxy the Mage in there as a Battlemage or something, and possibly some heavy conversation work to put the Prince on a Phoenix might be cool down the line. You've basically convinced me not to bother with fielding them as-is, which is unfortunate, but not horrific.
I definitely want Phoenix Temple as my army. I like Phoenix Guard, I love phoenixes, and the Anointed, either mounted up or on foot, are very cool to me. I just also wish to take advantage of some of the diversity that CoS offers aside from that. The lists you've provided give me great insight towards what could be done, and though none are 100% to my tastes I definitely appreciate it. The second one, featuring 3 phoenixes and some guard and casters, is probably the closest, but it and the third both have merits. Emerald Lifeswarm looks fantastic as a piece to have.
What I'm really looking to get out of this thread is less a specific build option and more simply helping myself to understand what build paths I have available. For example, starting around 500 points and building from there, if my starting force was the following:
1 Anointed
1 Battlemage
10 Phoenix Guard
10 Phoenix Guard
It's 510 points I know, but in a casual escalation league not really being taken seriously until we build up more it's not a big deal. The question is, where could I go from there?
What makes Phoenicium playable? Are there Sylvaneth units that are good enough to play Living City from time to time? If I'm running Phoenix Guard, do I want other varieties of short-range battlelines? These are the sorts of questions I'm really looking to answer, to get a feel for a new game.