Dormammu

Dormammu is one of – if not the – most powerful magic user in Marvel comic books and, as such, is pretty much capable of performing spells that enable him to do whatever he pleases.

The level of Dormammu’s magical abilities essentially puts him at reality-warping levels, and he has proven to be a threat to characters as powerful as Eternity and other members of Marvel’s cosmic pantheon – the kind of characters who should essentially be unbeatable.

He makes Doctor Strange – the Sorcerer Supreme, no less – look like an amateur magic user in comparison to himself, and the levels of power he can put out genuinely mean that he can beat anyone he puts his mind toward defeating.