Cultivators Caravan is also a good card to emerge in the late-game if you have the ability to Crew it and make it a creature first
Assassins with high activation costs tend to lose a lot of utility, but Kiku, Nights Flower deserves mention for being cheap to cast and a potential commander in her own right
Tovolar, Dire Overlord I said Id focus on cards that were better as role-players than as commanders, but Tovolar, Dire Overlord is pretty much the werewolf commander
Kaalia of the Vast + Kaalia, Zenith Seeker Lets put both the Kaalia cards, Kaalia, Zenith Seeker and Kaalia of the Vast, together because they both have a similar strategy and both are great Mardu creatures
If you don't want to carry a whole collection, look for a Rainbow Dash Equestria Girls toy , several of which feature all five colors
FromTheShire: We have seen Urabrask's Forge see a bunch of play and be very good not that long ago and Assemble the Legion was a house so this could absolutely be a thing