Jagged-scar archers answer your thopters just fine, as I found out the very hard way earlier today. In fact, so does Dwynen. It's a bad matchup, and you will run into it, lots. And elves could justifiably main deck enchant/artifact hate, I mean, why wouldn't they given the decent number of dangerous enchantments in the pool right now, and the fact that the hate is on an elf body.
I mention all of this, because BG elves is everywhere.
Edit: the question is worth discussing, even if the deck in question isn't artifacts. What's the answer in UR in general?
Realistically how many copies of
Jagged-scar Archers are people going to be running, though? Max 2? It comes down with summon sickness and after that it has to tap to kill a 1/1 flying token each turn. There's no way to untap it and kill multiple fliers at once. I think recovering from
Languish would be a more difficult than dealing with
Jagged-scar Archers.
Anyway, every deck has bad matchups. You don’t need an answer for everything in every deck. That’s why thopters (and elves) are linear. You’re not supposed to care about what your opponent is doing because what you are doing something synergy-wise that is supposed to beat whatever they can do without that level of synergy. But if you really want to dilute that strategy than you add
Claustrophobia and
Jagged-scar Archers can no longer tap to kill your stuff. You can add
Fiery Conclusion or
Exquisite Firecraft to kill
Dwynen, Gilt-Leaf Daen if you really want to…
Point being: there are plenty of answers. It's just, usually, not worth limiting your own startegy to make one bad match up slightly better. It'll cost you more games in the long run than it's worth.
edit: That's just my two cents. I don't want to fill up this thread with back-and-forth arguments so I'll leave the discussion where it's at until I actually get my hands on the game.