Who's the most powerful being that Magus with the 5 CCUs from Infinity War could beat?
Just a quick reminder of what Magus w/5 CCUs did :
a) Hide his presence from all other abstracts including the Classic LT (he said this is what was using a majority of his power for)
b) Imprisoned and comatosed Eternity AND Infinity
c) Slowly merge his shadow reality with 616 reality
d) Shut down the Ultimate Nullifier and keep it from activating
e) Even with the majority of his power tied up in keeping his presence hidden, he still had more than enough to casually obliterate beings as powerful as Galactus
IMHO, he actually had better feats than Thanos with the Classic IG (despite the fact that he claimed the IG gave him more power than the 5 CCUs).
I think he'd beat :
Anyone (even all the cosimcs from Infinity Gauntlet that ganged up on Thanos) up to the Classic Living Tribunal
Full Power Chaos King
COIE AM
The entire Cancerverse
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
If he decides to truly flex the power of 5 CCUs, he'd beat anyone below LT level and definitely all on that list, however,not sure he can truly kill the cancerverse beings
Post Retcon Beyonder erased Death from existence (as in across the entire MULTIVERSE). I'm sure Magus with 5 full Cubes can do that and more. He'd rewrite the rules of creation making it possible to kill them or just erase them.
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
Honestly never understood why multiple cubes for, what can 5 do that 1 can't.
Anyways I would say alot of people could still beat him and the ones you mentioned should stomp really. They are all Top level Multiversal powers which Magus here is not.
Also he better merge with cubes if he's going to fight directly with anyone or else he's in severe disadvantage.