This teaches new players just how impactful a good Commander can be, and gets them to think much more about when to play their Commander for max value and how Commander tax works once they've been removed
If you get a copy of The One Ring
Speaking of Limited-only cards from this round of MTG Final Fantasy leaks, Dwarven Castle Guard is another great example
This is a great commander: You get a four-color commander and cheap card draw with a vague enough restriction that you can do whatever you want, from artifacts to control to enchantress
Many creatures with the outlast mechanic grant extra abilities to creatures with +1/+1 counters, and certainly make great recipients of the backup ability, like Abzan Falconer and Ainok Bond-Kin
The decks other character, Cruella De Vil, Miserable as Usual, is a much cheaper card able to be played earlier on, and can force characters off the field when shes banished by returning a character to its players hand - playing into the decks more control-like tendencies