Others may become prepared by fulfilling conditions, for example, through the number of permanents an opponent controls, life lost, or anything else
After that, our total of 228 counts all Core, Standard Expansion, Supplemental, Starter, Compilation sets since 1993, as well as the jokey 'Un-Sets', one-and-done Box Sets, Commander Sets, and miscellaneous multiplayer products
The Indigo Mask DLC came out in two parts in late 2023, so Iron Boulder and its companions haven't had a chance to be featured in too many cards
Edge cases like regional promos, error prints, and pre-release cards may require the additional context field during scanning
SE Secret Rare Dragon Shrine X SPELL Send 1 Dragon monster from your Deck to the GY, then, if that monster in your GY is a Dragon Normal Monster, you can send 1 more Dragon monster from your Deck to the GY