Adaptive leaders are included because adaptive can pick arcane, and there was another putatively underpowered civ that could in theory benefit from such a merge, the Malakim. There have been any number of threads on buffing the malakim. My suggestion would allow them to make better use of their unique sand lions, and enhance a military advantage given by deserts, the afore mentioned sand lions. I also proposed this idea before the addition of a second hero to the Kuriotates and before the mounted tech rebalance. However, I honestly don't think that these made the Kuriotates up to par with other top tier civs seeing as they still suffer from a huge disadvantage on large and huge maps due to map sizes increasing at a much, much greater rate than their available cities. But I have not tested this, so my opinions on this subject may be wrong.
I would also disagree with the argument that this would make the Sheaim and Balseraphs less special, the Balseraphs would get 4 summons at a time per caster instead of the ungodly 9 they get now, but this would be greater then the 2 every other arcane civ would get. The sheaim would still have their eater of dreams that can, in the late game, easily summon ridiculous amounts of units during war time. And both of the above civs would keep all of their other powerful unique features (loki, arena, planar gates, pyre zombies, etc.)
As for the svartalfar, their mages, archmages, and liches are the only arcane units (world units aside) whose summons can't kill anything . This is mildly ironic considering they come from an arcane civ which is supposed to be good at magic relative to other civs. IMO, the extra summons would simply mitigate a gross disadvantage that they suffer in the arcane department.
That's the reasoning for my idea, I thought it could fix many of the balance issues in the game with one stroke.
