Myr Custodian

• WOTC Official Reminder Textofficial rules
  Scry — Look at the top N cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.

• WWizards of the Coast2023-02-04
  Official Ruling
  As the enters-the battlefield ability resolves, first you scry 2. Then each opponent in turn order chooses whether or not to scry 1. Those who do (likely all of them) look at the top card of their library at the same time, then they decide in turn order where their card goes. Each opponent will know the choices of previous players in turn order before making their own choices.

Rulings via Scryfall