The first version playtested poorly, so they changed it into a version that would have more functionality in the early game
The Grixis color combination isn't great at ramping mana, but vampires tend to be very efficient in their cost and rely on each other for benefit, besides, you are limited to casting one collected card on each player's turn, so it's not broken right
Weird exceptions like Finest Hour aside, this means most decks havent experienced the joy of the extra combat phase
You can only activate 1 "Kairyu-Shin's Dark Reef" per turn
Q: What is the difference between color and leader in One Piece TCG
Yes, the boxes will be well-suited for both scenarios, providing protection as well as attractive packaging