The unofficial but widely respected database Scryfall, which meticulously catalogs every version of every card, lists over 60,000 distinct printings for English-language cards, encompassing all unique artwork and expansion symbol variations
But that colored symbol is so much more than a simple indicator of scarcity
When paired with something like Loot, the Pathfinder, those once-per-turn exhaust abilities become far more explosive
Its valued by players because it gives them the ability to bring cards from the graveyard back into their current decks, which may prove crucial depending on what cards there are to be resurrected
A lot a really solid Equipment fall under this
While it destroys, rather than exiles, I honestly cant think of a single problematic creature in cEDH at the moment that has indestructible stapled to it, so that difference is largely irrelevant