dude, if you leave important parts out, don’t expect valid answers! if you build omnath abominations, fight through the stax and don’t complain. Suggest your Urza playing friend to also look at Mana Web, Tanglewire and others …

In that case just tell him that those two orbs in casual play groups just plain suck. Usually people get the point. I myself often have “sideboards” in my casual decks that make them a little less casual, for those situations where I need that little bit more oomph. So maybe that’s a way for him to go, leaving them out most games, but bringing them in every now and then, when he had a bad streak or faces some abomination himself.

If your pal is playing Urza and Winter / Static Orb, have a sit down with them and have a serious talk, because Urza + Orbs tends to at least scratch cEDH terrain – it might just be plain too nasty for your table.

On the other hand, Omnath as a green commander has access to a lot of the very best artifact removal – even free ones, like Force of Vigor. So Omnath – even if it is the mono green one – is quite prepared to take on Urza, if it is a more casual build (but casual build and orbs don’t usually mesh that well).

So, yeah, have a sit down and talk sounds like the more correct approach, because playing a tuned Urza at a casual table is just pubstomping.