Artifact removal for something that's 5/5 and can be 6/6 or bigger? That's going to have to be something in the vein of Duplicant or Spine of Ish Sah. Perhaps a tweak on Nevinyrral's Disk, I guess.

Equipment, maybe?

I was thinking something a bit more universal, like Brittle Effigy. But I haven't really given it much thought yet. Oddly, I was also thinking of equipment that you could also attach to opponent's creatures... but now doesn't seem like a good time to get experimental.

Oh, I should probably link to Ihsan's Shade from here as well. Ihsan's Shade.