Have 2 Foil Caverns and would take 2 regular Caverns or Bonfires for 1 foil cavern.

I see you need avacyn. any interest in a foil avacyn?

No, sorry.

Ok. Foil cavern is only going for 37 anyway. So it wouldn't be worth it to me personally to trade 2 bonfires for it. Good luck though! Let me know if you wanna make a deal on something :)

Is one of your Avacyn's non foil?

Yes it is