You dont need Orcish Bowmasters but he is absolutely one of the strongest cards you could add to the deck that fits in with everything the deck wants to do
By the time they formally recognized it with the release of Commander , it had actually been around for about 15 years
The ability to recast the adventure side once it dies as a creature from the graveyard is very good, and also keeps the creature coming back for various triggers, like leaving the graveyard, anything that cares about instants and sorceries being cast like Professor Onyx or Sedgemoor Witch, or when you cast creatures or they come into play
That said, premium versions of Muldrotha easily surpass $100
If each change takes the form of either cutting or adding a card instead of replacing a card, and you simply play a lot and cut or add cards as they seem necessary, you could potentially naturally evolve toward an optimal deck size of some number greater than 60