So I'm trying to build a couple Oathbreaker decks for the first time, for a friend visiting in a month or so (i.e. no huge time crunch).

I'm looking at either GB, Bolas, or UG. For Bolas, I've never done a three-color deck so I don't know if Bolas tends to lean more instant/sorcery, or aggro, or control. For GB, is Vraska my only option and is that a Drudge strategy or are there others? Finally, I love Simic for commander, but I don't know if their Walkers really hold up compared to others on the table.

I know that's a bit to request, but I would appreciate any help y'all can give. I'm fairly confident one of the two decks will be an Izzet Ral deck, as Saheeli is more artifact-based and I'm thinking the build should be more around spell-slinging.