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lol. I wonder if there is a rating system like that? Though, I am guessing most would be automated spam :)

Back in the early days of Splinterlands, I think they made personalized cards

It happens in Magic The Gathering, too. Some top players, usually. Meddling Mage is such an example. Dark Confidant. Snapcaster Mage. They often prove to be top tier cards, as well.