Note the use of the Japanese rarity, which is now applied to English sets, such as Double Rare and Ultra Rare
Thanks to this being an ETB effect, Panharmonicon and Blink shenanigans can make Mysterious Stranger even more powerful than anticipated
The fact that the effect is harder to stop and exiles is a pretty big deal against some things but again, the seven mana price tag means you probably run Degalmour or Krosan Grip if you really need that kind of security in your answers
The reason is clear: scarcity combined with fandom intensity
5 of each color included (White/Yellow, Blue, Black/Purple, Red and Green One side features an area to use for creature stats, the other side is open for any design
IF YOU SHOW UP WITH OUT AN APPOINTMENT YOU WILL BE TURNED AWAY