Kenessos, Priest of Thassa is a rare Legendary Creature — Merfolk Cleric card from Jumpstart 2022 (J22), collector number 13. Current market price: $8.25, TCGplayer market prices via Scryfall.
If you would scry a number of cards, scry that many cards plus one instead. {3}{G/U}: Look at the top card of your library. If it's a Kraken, Leviathan, Octopus, or Serpent creature card, you may put it onto the battlefield. If you don't put the card onto the battlefield, you may put it on the bottom of your library.