Secret Lair x FINAL FANTASY: Grimoire: Translating FF magic into MTGs five colors
Being a bit more specific, lets take a gander at the common core of good modular creatures, the ones that dont feel like an absolute waste of a slot to play on account of being a 1/1 for 1
I really don't think its the model
Generally, any evasive creature (like Kappa Cannoneer) can fulfill this role, but the specifics will depend on which commander youre playing
Powerful Trainer Cards: Essential for competitive play, trainer cards that offer strategic advantages are consistently in demand, for instance, Umbreon, Iono, Mewtwo, etc
Neo 2 also had a nine-card promo set that was released in Japan