Sharp-Eyed Rookie is a rare Creature — Human Detective card from Murders at Karlov Manor (MKM), collector number 353. Current market price: $0.19 (foil $0.21), TCGplayer market prices via Scryfall.
Vigilance Whenever a creature you control enters, if its power is greater than this creature's power or its toughness is greater than this creature's toughness, put a +1/+1 counter on this creature and investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")