Buffed Magneto looks awesome - but now it'd make sense to buff Rocket Raccoon
According to AuntMay, there are only 3 techs who aren't metal atm, and you kind of want to get class advantage when you can, right? However these 3 are:
Hulkbuster (which is probably mistake in their database or idk)
Starlord (already a great champ)
Rocket Raccoon (barely useful)
In the light of this, if the Magneto buff goes live as it is of now, it'd only make sense to buff Rocket, in order to expand a bit the handful of opponents that have passive advantage over his kind.