You can't cast a plotted card on the same turn it became plotted
My experiences with these decks in Cube leads me to believe that the support for artifact aggro is a bit light to see these decks consistently perform, but if the archetype is open I can imagine the best versions performing well
Now, because you could immediately pay a seven-fold of life for an equal amount of cards without anything else, Griselbrand was immediately impactful, and has been ban-hammered in Commander
This can be especially useful when trying to assess possible gems players havent discovered yet, which can impact demand for both single cards and the booster boxes they are found in
Command the Legends of FINAL FANTASY in Dazzling Surge Foil
But there is another type of crystal worth mentioning, which is also important in the context of Magic: The Gathering