yugioh ancient sanctuary booster box Decided to check what I had, found these. : r/yugiohshowcase With a high emphasis on defence Ancient Sanctuary | Yu-Gi-Oh! Wiki

(See rule 712, Meld Cards.") To meld the two cards in a meld pair, put them onto the battlefield with their back faces up and combined

Lower Text - Promo Info EXTRA BOOSTER SINISTER ORDER [EX-10] CLOSECLOSE EX10-021 C Digimon Lv [Counter] Blast Digivolve (Your Digimon may digivolve into this card without paying the cost.) [On Play] [When Digivolving] Suspend all other Digimon and Tamers

That's all changed in recent years, however

With that information captured, a counterfeit card could be produced

The rarity of this card comes from the fact that only a handful of copies exist, with only a small number surviving in mint condition