Only Magic: The Gathering has the design space to do something like this - where the return of an old mechanic actually feels very in-universe, and like a subtle inside joke, as well
Whenever a Mountain you control enters, if you control at least five other Mountains, you may have this land deal 3 damage to any target
Humans don't really have a similar card
Since any effect that removes a commander from the game only sends it back to the command zone theres really no way to get rid of their eminence ability
For instance, you might draw a poorly rendered version of your favorite Pokmon or put your favorite Pokmon in a funny situation (like Machoke checking out its muscles in a mirror)
Gaius van Baelsar Gaius is just very expensive for what he offers, as you are often getting significantly better than this for 4 mana in constructed, but he will be welcome in limited