Theyre perfect if you want to make custom tokens or a personalized version of your commander, your basic lands, and so on
Amethyst's version is this Olaf who becomes cheaper the more exerted characters your opponent has in play
There are a few cool ones in the mix, but theres also lots of forgettable dross
Zamazenta, Shield of Glory Beast-Warrior/Effect/LIGHT/Level 8 ATK 1500/DEF 3000 If there is a face-up monster on the field that was Special Summoned from the Extra Deck, you can Special Summon this card from your hand in face-up Defense Position
your opponent takes no damage until the end of the next turn after this card resolves, also, you look at your opponent's hand and all monsters they control, and if you do, destroy the monsters among them with 1500 or more ATK, then your opponent can destroy up to 3 monsters with 1500 or more ATK in their Deck
Artazon , for example, allows both players to search for a non-Rule Box Basic Pokemon and play it onto their bench each turn, boosting their early-game consistency or allowing them to find a specific attacker at the right moment