Don't know much about Deadpool, but unless he's been caught in a nuclear explosion I'd say Mercer "wins".
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Deadpool can survive a nuke. He could be annihilated to the molecular level and regenerate.
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Same with Mercer. Hm.. Would consuming Deadpool work?
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Then Deadpool would become Mercer lol. He'd be screwing himself over
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What? o.o How?