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And by the way, yes - why isn't Nostalgia mentioned?
Because it's a restrictive archetype, with the presence of GO (Guard of Order), just like, for example, Jebus, it requires a different, non-contact tactic. In general, it's an archetype with a different psychology, something like that.
I've played a total of 15-20 games, 5-7 of which were in tournaments, and I dare say that the tactic and psychology there are typical for other XL archetypes. At least, it's less similar to Jeb or CM (Chaos Magic) Nostalgia. Perhaps a little like Mini-Nostalgia, but only partially.