His ETB token-making ability is fine, but his transformed side really drives the deck: granting Web-Slinging to all your legendary multicolor creatures
You can even do it again if you want, thanks to harmonize!
The other neat little effect attached to Honest Rutstein is that it reduces the cost of all your creature spells by one generic mana, which throughout a game like Commander, can be a significant discount
Cards like "Harpie Channeler", "Elegant Egotist", Summoner Monk", and "Hysteric Party" allow the Deck to Summon multiple Harpies quickly and Summon multiple monsters from the Extra Deck
Other than that, in the Elfennotts Synchron Deck, which has come to occupy a certain tier in the environment, I have considered hiring Prison Priest, taking advantage of the fact that it is level 1