Guru Pathik is a uncommon Legendary Creature — Human Monk Ally card from Avatar: The Last Airbender (TLA), collector number 223. Current market price: $0.18 (foil $0.31), TCGplayer market prices via Scryfall.
When Guru Pathik enters, look at the top five cards of your library. You may reveal a Lesson, Saga, or Shrine card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. Whenever you cast a Lesson, Saga, or Shrine spell, put a +1/+1 counter on another target creature you control.