I have all of those (CC62 Bashira, CC52 Katie, CC55 Pallis, CC42 B. Iris). Didn't work. I either focus on keeping my units alive, in which case the phoenix stays up too long and some of the ants just walk past my melee units. Or I put down Bashira early to kill that bird, but then some of my melee units get killed. I could also put down the emperor early, but then I won't have anything to deal with the end rush. I tried twice, followed different guides with similar units than mine each time, only got 1 star each time. I don't remember the first guide, the last one was this:
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Katie got overwhelmed even with B. Iris' extra armor and from that it was a hectic mess without any strategy, trying to kill as much units as I can. my guess is that the lack of affection bonuses is the reason: Bashira and the Emperor are at 100%, the rest at 0%.
Honestly though, I don't care anymore. I got the gold dragonrider and 1 SC just doesn't worth this much effort. if this would be a 30/2 map, I'd experiment on it, but for 60/5? Yeah, no. That's why I didn't bother with the 90/12 maps yet. I already have Mehlis, so a cost reduction doesn't worth the effort. I'll try for Themis tomorrow (apparently a lvl 60 Emperor should take care of most, although I suspect those emperors in the videos are 10/10 skill, not 4/10, but one can hope), since I kinda want a princess if I have Sarah anyway. But honestly, unless those maps are 100% drops, the investment for a mere gold unit is kinda ridiculous.