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
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
The next set is also planned to be added later this month
Others may become prepared by fulfilling conditions, for example, through the number of permanents an opponent controls, life lost, or anything else
But in this case, the long tail has still been pretty solid consistently around five million daily unique visitors late last year, according to comScores chart
Edge cases like regional promos, error prints, and pre-release cards may require the additional context field during scanning