In my trade binder, I have a multicolored artifact. Should I consider it a artifact, or a multicolored card? The card in question is {Thopter Foundry}
Multicolored
Multi. Go by how you'd cast it. You can grab artis for any deck, but multis are harder.
I keep my multicolored artifacts with my artifacts. Frankly anything that has "artifact" as a type, goes in that binder. Reason being for building decks, if artifacts matter (metalcraft, affinity) I want them all in one spot.
I'd consider it a multicolored artifact