I also think it fun to observe the "evolution" of Kagemaru Himeno's style over the years
After looking at the research, we found that most players feel that when opening boosters, they quickly get to a point where commons don't matter (and then eventually get to a similar point with uncommons)
While you can flood the battlefield quickly, it takes multiple turns to reach this point, so you're going to be fairly exposed in the early stages of the game .
The product is also sold in parallel at the Card Collect storefront in Nihonbashi, Osaka
Sphere of Annihilation has already been put in one row with such monumental removal artifacts like Ratchet Bomb and Oblivion Stone, and rightfully so
And, of course, there's the companions - a mechanic so powerful it needed an errata and still has proven to be too strong