Here's an easy combo with dante:
l, m, h, s, m, m, h, qcf+l, qcb+l, h, qcf+l+m. At least that's how it was in Vanilla.
Magneto, they changed a lot so I don't know about him. Haven't played Strider enough to know combos.
Mags fly/unfly loop combo is pretty easy, it's everything else about him that's hard. For dante its his combos, and I still haven't gotten around to using strider yet. I'll just replace him with Wesker if Wesker is easier to learn