Eldarian

This happened to me as well multiple times. I would start casting summon earth elemental first with my sovereign, then a champion would start casting fire elemental on the same turn. The earth elemental would always be succesfully cast by my sovereign, but quite often (especially if he gets hit), my champion would not succesfully summon the fire elemental. (the cast button was activated again though, so if he wanted he could try to cast again, but there was no feedback as to why he didn't