As far as i know MMH and Plastic man don't have blood, so i guess they stomp Magneto and Storm
Isn't MMH blood actually more rich in iron then normal humans? ( not saying he can't beat mags cause he can) and Plastic Man can be frozen so maybe Storm can Flash freeze him. Storm can't kill Plas but she might be able to immobilize him. Mags or Storm can't stop most JLA line ups for sure though.