The Gruul Clans (red/green): The Gruul Clans were originally the Guild of Savage Nature, appointed to speak for and protect the people who lived in the harsh natural environments of Ravnica
Black/Red: Noncreature Spells (Aggro) As the saying goes: theres more than one way to race a chocobo, and theres more than one way to play a noncreature spells deck
This doesn't just include the general dimensions - understanding the size and spacing of font, art, and borders can all help identify a legitimate card, too
Theres no way, whatever your criteria, that youll get to the end and without asking, Steve, sure, but what about this card?!? I could have populated this list with staple commons like Counterspell and Elvish Mystic and probably been pretty accurate, from one way of looking at things
I find myself to deeply enjoy flavor in deckbuilding and I can tell that sometimes I even find synergy in flavor combinations/concepts that feel so great that you can ignore the fact that they are not the optimal choices