I had something come up this morning and I can't find anything to prevent it, but it seems really silly. Can an Imperial player use the Imperial Temporary Alliance to field a Mercenary Temporary Alliance and then play Rebel cards?
Temporary Temporary Alliance
The FAQ addressed this and it is not allowed:
"For example, a player cannot use the card “Temporary Alliance” to add Skirmish Upgrade cards from other factions to his army."
Awesome. Thanks. I overlooked that part, but I knew that couldn't be right
Also, Temporary Alliance is Unique, preventing this from the beginning.