Hmm... you know, if Fate followed the motif of a Pokemon game then you could have two "versions" where only certain servants are available in each version and you'd have to trade between the two.
I know this is just me throwing darts at a border, but this is a more intriguing idea than the picture probably warrants.
Also I give credit to those Pokemon as they're about to run into the equivalent of high-grade artillery fire.