The token created by Urza's first ability will count itself, so it'll be at least 1/1
Adventures in the Forgotten Realms Set Boosters contain: At least 1 rare or mythic rare card (approximately 27% of Set Boosters contain 2 rares or mythic rares, 3% contain 3, and it's even possible to open 4 though that's less than 1% of the time.) 1 Traditional foil card of any rarity 1 Rulebook, module, or borderless common or uncommoncheck out the Collecting Adventures in the Forgotten Realms article for details
32 Wasabi Methodical Engineer League Promo cards 32 Honey Lemon Chemical Genius League Promo cards 32 Minnie Mouse Pirate Lookout League Promo cards 64 Rescue Rangers Away
Library manipulation cards like Sylvan Library and Scroll Rack will help make this card more consistently awesome
The deck itself may not boast the highest rate of swarming, but being able to summon possibly one of the strongest Xyz monsters with as much ease as your average Rank 4 monster is what really gives this deck a claim to fame
Using the two sides to give a wider color identity was also a nice touch here
