I don’t know if this is old news but if you ever heard of the term Back Dash Canceling, yes it’s the same Back Dash Canceling(BDC) or some might call it Korean Back Dash in Tekken is also applicable in Marvel vs. Capcom 3. It is great for spacing out with youe opponent in Tekken and even greater spacing in Marvel vs. Capcom 3. If anyone doesn’t play Tekken, here’s the input.
First input the first back dash with b,b then cancel it out with d/b then input the second one with just only b then cancel it with d/b and so on. Don’t know if the N state is important in Marvel vs. Capcom engine.
Hope this help.