Buy @ TCGplayer
Metalcraft — Spiraling Duelist has double strike as long as you control three or more artifacts.
If Spiraling Duelist has double strike as the combat damage step begins, there will be a second combat damage step. As that second combat damage step begins, if Spiraling Duelist no longer has double strike (perhaps because an artifact creature you controlled was destroyed), Spiraling Duelist will not assign combat damage a second time.
