Wary Farmer is a common Creature — Kithkin Citizen card from Lorwyn Eclipsed (ECL), collector number 251. Current market price: $0.10 (foil $0.16), TCGplayer market prices via Scryfall.
At the beginning of your end step, if another creature entered the battlefield under your control this turn, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)