The activated ability doubles the number of goblins under your control, offering you a constantly increasing board presence alongside more ETB triggers than you know what to do with
Perfect for collection or investment
Bulbasaur 44 - First Partner Pack The Pokmon Company Unless all damage from this attack is prevented, you may remove 1 damage counter from Bulbasaur
They also might have a high ceiling or a low ground for how powerful it can get
ASHIOK, NIGHTMARE MUSE Ashiok, Nightmare Muse is the closest 2020 design to what I think of as the default Planeswalker subgame: CMC 5, uptick for card advantage, downtick to kill a target, big splashy game-winning ultimate
There have been other impactful ones since this Kaladesh (2016) card, but this was a key card in Standard for its whole stay and has also seen play in both Modern and Pioneer, as well as Explorer