If you do, discard a card
Mulligan harder, add more cheap interaction (especially for artifacts and enchantments), and make your mana base less fragile
Besides these two sets, Prize Pack series 3 introduced the Scarlet/Violet set bit by bit with notable Pokmon like Gardevoir ex sv1 86, Banette ex sv1 88, and Miraidon ex sv1 81
While some of the decks steal effects dont require you to pay mana to cast the cards you pilfer, many of them do including Gonti
Because Helm of Obediences ability only stops milling once it has either milled X cards or a creature, if you have a replacement effect in play that exiles cards when they go to the graveyard, the Helm never sees either of its conditions met, and it just mills the entire library
Far and away the most probable path is that hes $.25, but Id be doing you a disservice if I ignored the possibility that Shu Yun could actually be disgusting