Mentor's Guidance

• 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 Coast2021-04-16
  Official Ruling
  The triggered ability will trigger when you cast Mentor's Guidance no matter what permanents you control. As that ability tries to resolve, it will check to see if you control at least one permanent with the listed type or subtypes. If you do, Mentor's Guidance will be copied once, not once for each of those permanents. If you don't control a qualifying permanent at that time, the triggered ability won't resolve and it won't copy Mentor's Guidance.

Rulings via Scryfall