The first player cannot attack on their first turn, and neither player can evolve a Pokmon on their first turn
You remove a counter to populate, making more creatures
High-class sets feature larger booster packs, guaranteed Pokmon ex pulls, stronger rarity distribution, and premium collector-focused cards
They are also helping in case you only need some specific Korean items, which is great
Of course, building your deck with the only creatures being one Street Wraith and two Emrakul, the Aeons Torns is a big cost, and you'll have to play a bunch of ways to tutor up your one Street Wraith for the plan to work, but this plan is actually very similar to that of various Possibility Storm and Polymorph decks, which go to great lengths to ensure their seemingly random payoff is anything but