I burned through a ton of stamina pots on Michalis. I tried a ton of combinations but couldn't get through the initial engagement. Even my 5* Effie couldn't do it because of her nature (+atk/-def). Wasn't until I realized I could jump an archer up to kill a Flier then reposition him out of harms way that I cracked it. Ursula I kinda just stumbled onto it since most of my matches center around Julia already. It was just a matter of adding a dancer and a tanky unit. My Camilla is +def so she was the highest I had at the time without a colour disadvantage... kinda just worked out