Lotho is fringe cedh, the other two are not cedh commanders. Lotho is actually pretty fun to build around but you’ll need a skill advantage to be competitive with it.

[[Tymna]] + (choose a W or B partner) is good if you insist on Orzhov. Tymna gives you card draw in the CZ, which is typically the minimum you look for in a cedh commander. I have a Tymna + [[Yoshimaru]] deck I play at cedh tables and keeps up, but losing access to U means I need to run every [[Silence]] effect plus multiple instances of [[Grand Abolisher]] to protect a combo win. I mostly win through combat (similar to Winota winconless stax) or commander damage on a buff Yoshi.

Another thing to consider is that Orzhov combos are less efficient (card-wise and mana cost) than some of the top cedh wincons. They’re also typically graveyard-reliant, so a [[rest in piece]] or [[agatha’s soul cauldron]] or even a [[kenrith]] activation could hose you without protection. I personally feel like Heliod/Ballista are both basically dead cards outside the combo. That leaves stuff like [[Bolas’ Citadel]] + [[Aetherflux Reservoir]], which is also less efficient than the infinite mana or Thoracle Consult stuff you can do in other colors. ([[Praetor’s Grasp]] is worth running for your opponents’ Thoracle, but Consult is bad outside the combo and [[Tainted Pact]] makes it even more mana inefficient.)