Fallen Knight

Note the summoning of the "Shaitan-bab." They can be summoned as many times as you like outside of battle, like this! The question is, how can blue get the Portal spell if it can only be researched in Mythgard, which he isn't even attacking.

Blue can build a Guild of Mages in his cities, which will give him the Portal spell. I don't want to cancel the construction of the Guild yet.

Added after 19 minutes
As for summoning them, as you called them, "Shaitan-bab" - I will probably make it so that summoning them costs the player some experience.