Evidence Examiner is a uncommon Creature — Merfolk Detective card from Murders at Karlov Manor (MKM), collector number 201. Current market price: $0.06 (foil $0.08), TCGplayer market prices via Scryfall.
At the beginning of combat on your turn, you may collect evidence 4. (Exile cards with total mana value 4 or greater from your graveyard.) Whenever you collect evidence, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")