Take a look at this Redditors Skarmory card, which was misspelled as Skarmoty: Errors in the Pokemon name, HP, and card number may also be present in a fake card
Take Ephemerate from Mystery Booster and Giver of Runes from The List as examples
While this card is not useable in an actual match, it does come with the players signature in the card art
(To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.) Sacrifice Cryptex: Surveil 3, then draw three cards
3 "Tindangle" monsters Gains 3000 ATK if you have 3 or more "Tindangle" monsters with different names in your GY, including "Tindangle Base Gardna"
There are also a fair amount of rare cards to be found in the Sword & Shield - Brilliant Stars Trainer Gallery