As an aside, the fact that Yuuya was able to handle the extra deck summoning method all came from the cards of other-dimensional humans
Ideally, you would want to trigger Kelbek's milling effect as much as possible, in order to fulfill the requirements for Exchange of the Spirit
Instant Protection (CTRL to add secondary) Ramp Ramp (CTRL to add secondary) Removal Removal (CTRL to add secondary) Tokens Tokens (CTRL to add secondary) Treasure Treasure (CTRL to add secondary) Tutor Nature's Rhythm Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle
But in conjunction with Restage, it's especially fruitful
Usually when a card got a line like that, it's for preventing the card to be cheated out of the Extra-Deck and be abused, but I don't see how it could be with this card
Bring a Core Constructed Deck to play for the tournament's entirety