It has beneficial modes for you and detrimental effects for your opponents, it plays to different aspects of the game, messing with the battlefield, graveyards, and life totals, and it does all of this at instant speed
While this tactic works with most products, because of the high profit margin of these boxes, players can make an endless amount of money in no time
Hieratic monsters might not have effective methods to swarm the field, but can take advantage of their Tribute mechanics to use "Virus Cannon" while also summon Normal Monsters in the process
and/or other countries
This will also be true of Draft Boosters
This rarity symbol system in Pocket would suggest these are the rarest of the common cards, but it turns out theyre even rarer than one-star Illustration Rares