All of the decks that were previously bad Karn decks now are in the clear to ramp into a way to select the right hate card
We wouldnt play a spell that does this, but a land like Inventors' Fair has far less of an opportunity cost to put it into a deck
Arceus/Mewtwo is known for flooding the board with Energy thanks to Arceus's Trinity Nova attack, which makes it easy for Starmie to attack for big numbers
[Activate: Main] [Once Per Turn] You may rest this Character: Play up to 1 Character card with a cost of 3 or less from your hand
This forces collectors to go out of their way to secure these limited-edition items, further complicating the pursuit of a Master Set
2-3 Booster Packs: Rare Candy, Full Art Zekrom/Reshiram, very strong/needed rare cards (Emboar Ability usually goes for 2 more often than 1), all Prime Cards other than Zone, Mega, and Donphan