cr.:l::m::h::s:xxsj j.:h:(pause) addf j.:h:st.:h:xx:qcb::l:[ (buffer super jump) sjub (or sjuf) > addf (or add) j.:h:st.:h:xx:qcb::l:]x5 ~ 570,000-580,000 Damage
You have to buffer the super jump as soon as Magneto's body starts glowing from the Hyper Grav and you should airdash down as soon as you see the opponent's body fly up. The most important note is READ THE FORUMS
because this forum literally gets a question about how to do this combo everyday and every time it's the same answer and no one likes repeating themselves. This is one of the pillars of Magneto combos since you can tack on 1-3 of these after basically every combo on this post that connects a Hyper Grav :l: in the corner.