yugioh tuner deck Kewl Tune Synchro – cardcluster Tuning - Structure Deck: Synchron

Before Duraludon we had Sandaconda, Flapple, Copperajah, and Centiskorch

Secret Rares, also called Rainbow Secret Rares are a mainstay among the most popular Sword and Shield sets, and Darkness Ablaze's most expensive cards feature several of these special patterns

Other Pokemon have their moments

Ninjas are sneaky, but each can be found in Set, Draft, and Collector Boosters, in both non-foil as well as traditional foil

It's therefore clearly not worked, but has turned much of the community against the developer

Furthermore there are specialized marketplaces like Cardmarket, where collectors can sell their cards to interested parties