i was bored and accidentally found this out. people might know already, but who cares. i found it out by accident
Magneto, storm, ironman. doesnt matter what order as long as mags is first
launch + storm projectile /\ sj.hk, addf, hp, hk / projectile hits, c.hk (delay as late as possible, character is popped up TAG ironman, tag kick HITS, infinite to corner about 40 hits xx proton cannon.
tips if you cant do it: make sure the last rep of the infinite you are jumping straight up not u/f. it makes the proton cannon hit more solid (sometimes the charcacter pops up a little resulting in less damage). also, make sure storm is completely off the screen before you try and tag. you can tag pretty late and it will still work
if you cant get the juggle action from magnetos c.hk then try launch /\ hk, addf hk (do pretty slow) storm projectile hits, c.lk, c.hk
cant roll, cant mash, one super, all 3 characters get a piece of that ass, very simple, how fucking sweet is that?
its pretty much open for any tag, so free combos with any character you want