You get out what you put in
Target creature you control fights target creature you don't control
The ability will trigger no matter what happened to the artifact after it entered
And in yet another stroke of luck, we found out that the excellent Liberproxies is based not far from where I live
[30] [33] Typically, "creatures, enchantments, and artifacts stay on the playing field whereas sorceries and instants are placed in your discard pile
My first impulse was that if you use it alongside cycling cards, you can throw one mana cards into the graveyard, exile them with these two, and cast otherwise uncastable spells for free: Crashing Footfalls, Ancestral Visions, Gaeas Will, Hypergenesis are potentially cool, but also what does it matter if you draw a lot of cheap creatures