And, yes, this card does indeed untap itself
Apart from the issue of some cards not having playable substitutes, the other reason I tend to dislike this advice is that part of what makes formats like Commander fun is the diversity that they offer, and this diversity is built, in part, on players being able to access and play with weird, old, nostalgic cards that don't really see play in other formats
Any deck looking to run a toolbox-style strategy with the sideboard could also use it
With no good way to depict the typeline 'Human Goblin Villain' in a single character, Wizards invented Goben, a mad scientist sort and his goblin test subject, Fleem, a gremlin-esque little guy with a goofy grin
Along with that, it has an attack called Twin Shotels, which does a flat 50 damage to 2 of your opponent's Pokmon, no matter what their Resistances or Weaknesses are
If you're building a Team Rocket collection, this is one of the centerpieces