Loxodon Eavesdropper is a common Creature — Elephant Detective card from Murders at Karlov Manor (MKM), collector number 168. Current market price: $0.10 (foil $0.23), TCGplayer market prices via Scryfall.
When this creature enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") Whenever you draw your second card each turn, this creature gets +1/+1 and gains vigilance until end of turn.