Lets kick it Kaladesh style
The important mainline releases are Pokmon Red and Green (and Blue, a special edition released later) on the Game Boy, Gold and Silver on the Game Boy Color, Ruby and Sapphire on the Game Boy Advance, Diamond and Pearl on the Nintendo DS, Black and White on the DS, and finally X and Y on the 3DS systems
I think the most notable example of this is the four Sea Monster creature types that were first referenced on Quest for Ulas Temple Kraken, Leviathan, Octopus, and Serpent
The archetype got a boost later with Reshiram ex in White Flare , but Budews Item lock is still a major problem
Giving flying to Sefris can make him a potential source of threating Commander damage especially if you keep going into "Storeroom" room to make Sefris bigger
They offer unparalleled artistic freedom