Wary Farmer

• WOTC Official Reminder Textofficial rules
  Surveil — Look at the top N cards of your library. Put any number of them into your graveyard and the rest on top of your library in any order.

• WWizards of the Coast2025-11-17
  Official Ruling
  Wary Farmer's ability will check as your end step starts to see if another creature entered the battlefield under your control this turn. If none did, the ability won't trigger at all. A creature entering the battlefield under your control during your end step won't cause the ability to trigger.

Rulings via Scryfall