Tinybones, Bauble Burglar can both support and lead your black discard decks, and its a cheap creature that represents a fan-favorite character
The Three Brothers not only gives you one deck but multiple dual-color Leaders (Black/Yellow Luffy, Red/Yellow Sabo, and Blue/Yellow Ace) letting you experiment with different strategies using the same card pool
This effect wasn't once per turn, so Substitoad could keep Tributing Monsters in order to search out more and Tribute those off for burn effects with cards like Mass Driver and Canon Soldier
Fetch lands tutor specific types of lands from your library
Of the four revealed, I would peg Meowth ex as the most valuable given its universality in the Pokmon TCG competitive scene right now, with Mega Starmie ex a close second
The new aftermath ability lets instants and sorceries in on the graveyard party with a new twist on split cards