It's an entertaining one that works really well in formats where you can easily put cards back in your hands, and is especially good on legendary cards because it keeps extra copies of them from being redundant
The examples of commanders who punish our opponents for doing things isnt as easy to populate, though, is it
You can also shortcut Etratas win condition completely by using the other cards which place hit counters: Ravenloft Adventurer and Mari, the Killing Quill
You can also do a lot of different, useful things with arguably the best charm for Commander, and it's a very flexible 3-mana counterspell
In essence, itll grow at a similar rate to a Managorger Hydra and quicker, if you have fetchlands
One property that seems ripe for a Magic: The Gathering adaptation is Star Wars