scythe

who would win in a fight Optimus prime with the attachments from rise of the fallen or death scythe from gundam wing, the one from endless waltz

Ok me and my friend are going as Buffy and Faith to a dress up party :D We were wondering if anyone knows or has any ideas on how to make the Scythe that Buffy usually wields and Faiths Jackal knife. And suggestions would be much appreciated :D