He will be Marvel's equivalent of Kang the Conqueror. Except worse as Chaos magic can grant wishes and has unlimited potency.
He's basically Vandal Savage but if he was a mammoth.
The similarities are rather uncanny, but that's probably a given since he was probably inspired by Vandal Savage himself.
Both from the prehistoric era (Vandal Savage born on earth in 50,000 B.C. as a caveman, Mammoth Mogul being around during Mobius' prehistoric age who were granted immortality through some form of energy (An emerald embedding into Mammoth Mogul's chest, Vandal Savage being bathed in radiation from a meteor that fell from space), they would go on living for tens of thousands of years being master manipulators to achieve their particular goals.
In other words Vandal Savage and Kang the Conqueror put together but a humanoid mammoth.