That's exactly what I want to hear regarding these EX sets.
I can easily see and remember in what kind of match she would help me to win, because once I tried using Emana with Maid in tournament.
But I can't be sure because attack immunity might help my enemy to pinpoint kill a certain card easier.
Like for example sniping Metia/Emana with 3 range unit on first row, or making sure one of my card will die since all enemy firepower concentrated on her.
Once I used a Royal Guard Priest in Refess file that give attack immunity to one unit, but it ended up making enemy able to hit and finally kill the tank on front row instead of spreading the damage among the tank.
Yeah... gonna think about it before buy or skip the EX.
To be honest, if I have Emana I probably won't use EX Soldier anymore.