Not necessarily because theyre the strongest, most overpowered commanders in the game, but because they do something new, or breathe life into an old, tired archetype
If you have Narset, who follows the ancient path, you can also use it as a means of shooting 7 points at an opponent's creature or flaker
Celestic Town Elder allows you to put a discarded Basic Pokmon and put it back in play
Paramount War Chase Cards: What's Worth Money The manga-art Ace, OP02-013 is the crown of the set, and it stands a long way clear of everything else
You get an immediate benefit with the enters trigger, so using some blink or reanimation effects get you mileage even if you cant attack
I have this ex card in my collection