Artifact removal, commander protection and (to a lesser extent)
Homeward Path effects are all things that are usually pretty good to have in your deck anyway and ought to help against this one in particular.
However, it would be good to know more about the decks. It might just be that this Urza deck is more powerful than your deck, for example, or it might be a particularly bad match-up. Urza is a very powerful commander, but that doesn't mean this deck is; it's really hard to know without more information. Also you mention stealing specifically which doesn't in and of itself have anything to do with Urza so, again, knowing what sort of effects we're talking about and how many would be really useful. Is this "steal tribal" which just has Urza as the commander for value, or is it a powerful Urza deck that's just running one or two steal effects, maybe ramping into a big
Mass Manipulation, whatever?