The first release came out with just 36 cards (part 2 onwards had 151 for this generation (excluding the 2018 reprint)), so it wasnt a very weighty release and only developed into a massive, branded product line, over time (which it now is: with more than 300 million units sold over its lifespan (Japan has 126 million citizens))
Every person who buys a Miku lair after it sells out is a buyer that Wizards could have made money from
UB can play off the same strong commons and uncommons as UR does, and it has some great expensive spells to pair them with like Sephiroth's Intervention, Ice Magic, Dreams of Laguna (flashback), and Sidequest: Hunt the Mark
(You may put the top card of your library into your graveyard.) Madame Web lets you look at the top card of your library whenever you want (with one restrictionsee below), even if you don't have priority
In Final Fantasy VII Remake , the party can spend a bit more time here, but Seventh Heaven itself continues to make up only a small amount of the game overall