Hmmm... I may have found a hidden requirement for the spell. I tried all the tips you guys posted, but still wasn't getting any red dragons. Then I had a thought - not only was I not getting red dragons, I also hadn't gotten any green ones, the two level five troops that are in my army. I decided to try temporarily ditching my red dragons in a castle, and sure enough a few reloads and uses of call of colossus later, I had 11 brand new red dragons.
I think that the spell can only summon units you don't have in your army.
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