The equivalent to the magic sword in Druid practice is the iron or steel sickle. You can get an ordinary gardener's sickle -- small ones work better in ritual practice -- or go for something fancy:

Consecrate it using a working based on the wand, cauldron, and crane bag, and you're good to do. Don't use the Circles of Power ritual -- it invokes different forces, which you haven't learned how to work with.