Angelic Sleuth is a rare Creature — Angel Advisor card from New Capenna Commander (NCC), collector number 113. Current market price: $1.17, TCGplayer market prices via Scryfall.
Flying Whenever another permanent you control leaves the battlefield, if it had counters on it, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")