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I think Scarlett witch…
Because she is incredible magic powers.

Captain Marvel! She kinda is a Cosmic Entity now. So I would go with Hulk, because he was able to withstand Powers of all the Gems when he snapped and de-decimated everyone.

Hulk, hands down.
You asked Marvel, and not MCU.
So by that clarification, Hulk’s strength increase as he gets more angry. And there is no upper limit to that.

Scarlett witch
captain marvel
thanos

In my opinion its hulk and Scarlett witch