Mr. Universe
Senior Member
Thanos get the Heart of the Universe
Dr. Strange summons the power of all three Vishanti into himself making him nigh-omnipotent, and amplifies that power with the Infinity Gauntlet. (heh, imagine that). He also duplicates himself an infinite number of times, along with the legions and hoardes of the Dark Dimension and Hell.
Reed Richards can spend a year making the UN more insane than it already is. He could basically re-write the damn DCU.
Dr. Doom goes back in time to attain the Star Brand, and masters it for a year, becoming exceedingly adept at it. He can do anything he wills, making nigh-omnipotent. He'd be able to will all DC cosmic entities away.
Apocalypse travels back in time and steals the M'Kraan crystal from D'Ken and masters it all the while. He sucks the DC reality into the crystal.
High Evolutionary attains a cosmic cube within a year. He masters it within the given time and uses his powers of technology and new found omnipotence to de-evolve all of DC's entities.
They can feasibly win this.