what do code cards do in pokemon Card - 151 Booster Pack - SV: Scarlet & Violet 151 I see a lot of

Precon Leagues: It's an investment

7 Crown Zenith Ditto (Numel) This card has one Ditto disguised as the third-generation Fire-type Pokemon Numel, blending into a herd of them

Furthermore, there are many more widely played formats (such as Tiny Leaders) I could provide a link to, but the reality is that if you include all those formats in your definition of previously banned, some person will eventually just invent a format that bans every card but basic lands, and therefore will be able to tutor all cards

Duel Masters is also published by Wizards of the Coast (in case you didn't know) which perhaps explains why the reference in this case is able to be so on the nose