As Emchompite explains, Japanese booster boxes have predetermined hit rates, so the population of cards is higher and overall "rarity" of cards is lower
It's the first spell on my Top 5 Proper
From watching plenty of those MJ Holding boxes getting opened that contain graded cards, those will very often feature a grade 7 generic card from a recent set, worth far, far less than it would have cost to grade it in the first place
Celestial Purge, Combust and Deathmark are joined by Glare of Heresy and Dark Betrayal, which when combined with colour changing options, such as Scuttlemutt, and a greater inclusion of hybrid cards (discussed below), have the potential to become premium removal options
There has been one of these types of sets for each generation since (up through SV so far) - Shiny (Baby Shiny) - Shiny Super Rare (Shiny Full Art) Throughout all 3 iterations so far, they have commonly had a silvery-textured background in the picture box behind the Pokemon