Personally, we don't see the appeal, but fans' cards are theirs to do whatever they like with
Indestructible Another way to take advantage of Iron Muscle providing indestructible is to make use of cards that destroy all creatures, like Damnation, or deal a bunch of damage to creatures, like Blasphemous Act
You can lean into a sacrifice theme, running the Scam cards from Modern decks like Fake Your Own Death and Undying Evil to return cards sacrificed for value with Ashnod's Altar (or similar cards)
It pairs incredibly well with evoke because if you cast it with the evoke sacrifice trigger on the stack, not only do you get a second enter the battlefield trigger, but you also get to keep the creature
Deathtouch Youd think an exact wording on deathtouch wouldve been in the game before now, but Wizards didnt nail it down until Future Sight