Strange, Batman & Hulk as One vs Thanos
The Grandmaster has offered Thanos of Titan membership into The Elders of the Universe. Thanos has to defeat a being of The Grandmaster's creation that he claims will rival the power of The Mad Titan. An amalgam of 3 earthborn mortals, from two different realities.
Intrigued and not having had a challenge in eons, Thanos mulls the offer. The thought of adding the Power Primordial to his own personal might is too much to bear. If he were to tap into it in conjunction with The Fallen One's black matter and his own cosmic might...the possibilities would be endless. Thanos accepts.
Knowing that Thanos couldn't resist such an offer, The Grandmaster has already commissioned his fellow Elder, The Collector, to gather 3 individuals to hold in stasis. For raw strength, they have The Hulk. Mystical might and preparation is present in the form of Earth's Socerer Supreme, Dr. Strange. And for for raw H2H fighting skill and prep ability, Batman.
The Grandmaster concentrates mightily, drawing upon The Power Primordial. An instant later, the 3 are merged as one, with all of the abilities, experience, artifacts, and equipment of each at his disposal.
Each has one week to prepare...who wins and how?