Taking from both of the people above and not to discredit them and using also, here is what I did to make it go by very quickly if you have already passed Mephisto's realm with the infinite imps.
1) get invisible woman and use her invisible and telekinesis skills put all points into telekinesis first as some of the enemies may be "heavy" im unsure
2) go to one of the asgard sim missions, I kept doing piledriver myself.
3) get to the bridge and use invisible womans invisibility and telekinesis and throw them off the bridge. This will keep you healthy and practically mana full as all the enemies will be focusing on your team making them easy targets.
NOTE: I tried using dr. strange for this as well but his levitate ability seemed harder to throw enemies over the edge as inviso womans seemed to glide over the railing for the ledge easier