Hostile Investigator is a mythic Creature — Ogre Rogue Detective card from The Big Score (BIG), collector number 75. Current market price: $1.60 (foil $1.53), TCGplayer market prices via Scryfall.
When this creature enters, target opponent discards a card. Whenever one or more players discard one or more cards, investigate. This ability triggers only once each turn. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")