Humans has historically employed four-drops in the sideboard to give the deck a little bit of post-sideboard staying power, and I like what Urza and Yawgmoth bring to the table for this purpose
Ultimately, Pauper has a lot of easily accessible graveyard hate so cheating it in from that zone will have its issues, but people jump through those hoops to get cheap 5/5s already so maybe this can help Green get back into the fight
However, there are better options like Venom Swamp which can continuously apply Venom Counters and have a more significant impact on the game
While it has a lot of low-cost cards, this isn't a hyper-aggro, go-all-in kind of deck
With enough pulls, your deck can get rarity maxed for you to show off to the world
On the way, Byron and Kazuma bonded over their sons, who loved Dueling, with Byron saying that Faker also has two sons