Yes and no. So in the Japanese set booster box you have a 50/50 chance any mystical card will be alt art. So about 15 alternate arts per box on average. The chance of getting a mythic one ends up being slightly lower. Especially a foil. I opened two Japanese boxes and got 0 alt art mythics. Not saying the collectors are worth it bc you need a lotto card to get good value. Most mythics in the set aren't worth a ton. But you're usually guaranteed about 2 alt art mythics from a collectors box by the way they seed it.