I would suspect that for the short term off world magic and tech would work but the more they were used the less effective they become until kaput.

Yes pick up tech there and your magic should work. Tech from other worlds should be able to swap out normal power sources for "spirit" or magical ones.

I am actually looking forward to fights here as the concept is one that intrigues me. I have been toying with making a technomacer and setting him up here, ready to defend the world of Mystique. A technomancer who is often imitated but never duplicated, ready to lay the smack down on any damn jabroni who wants some. Cannnnn you smell what the magic brings!!!!!! Boots to asses....*drops mic*