I don't think it would work well against the two buff-related Scorpions; if a creature's ATK can't go below 1, then technically the Momentum + (insert Scorpion here) combo still works. Personally though, I wish that Asmodeus was a card in an element (any element, actually), but I can understand why it would belong to Other for the sake of game play balance, even if it doesn't feel right thematically.
I would say that it should stack, given its somewhat expensive cost and frail nature, you can't or don't really want to 'spam' it against high-control decks.