The Scythe is 2 Handed. You could put a Scythe and a Sickle together on a 4 armed or 3 armed creature. If the Sickle effect is 'within melee range' the Scythe would work well, since it attacks an entire square at a time and cripples everyone in the square and always hits.

Though by that same token, you could put the sickle on something big and tramply and have them trample through enemies getting gems (with I don't think works, but I haven't tested it specifically).

Something to try.

P.S. Most of the Artifacts are 'worth it'. Even those that don't give an overwhelming power or ability they are usually very cost effective for what it gives. Though there is certainly runts of the pack.