The Reaper has been in the Mutant Liberation Front since they were first introduced. He lost his hand while in a fight against Shatterstar of X-Force, prompting him to get a cybernetic implant for a hand. Some time later, when fighting against Shatterstar again, he lost the other hand.

When trying to recruit a mutant named Siena Blaze for the MLF, he was accidentally placed in an alternate reality called the Ultraverse. He remained there with Siena Blaze and a few others forming the Exiles until he returned back to Marvel proper.

It was revealed that the Reaper has lost his abilities thanks to the events of M-Day, but he regained them again after interacting with Quicksilver. It is unknown if it's temporary or not.

Powers

Reaper has a stunning touch which he can channel through metal objects, including his sickle and his prosthetics. He eventually gains full cybernetic limbs which can transform into scythe blades.