Doom vs Loki vs Thanos
each has complete knowledge of the others and each has been tasked with the job of killing the others. they have 1 month to prepare. at the end of the month they are placed in an unbreakable, planet sized dome. inside this dome, thanos CAN die if they can figure out a way to kill him.
anything they have done or used on-panel save the IG and the beyonder's power is available to them in this battle if it can be argued they can retrieve said power in 1 month.
who's left standing?