Surveillance Monitor is a uncommon Creature — Vedalken Detective card from Murders at Karlov Manor (MKM), collector number 73. Current market price: $0.11 (foil $0.10), TCGplayer market prices via Scryfall.
When this creature enters, you may collect evidence 4. (Exile cards with total mana value 4 or greater from your graveyard.) Whenever you collect evidence, create a 1/1 colorless Thopter artifact creature token with flying.