Agrus Kos, Spirit of Justice is a mythic Legendary Creature — Spirit Detective card from Murders at Karlov Manor (MKM), collector number 184. Current market price: $0.33 (foil $0.65), TCGplayer market prices via Scryfall.
Double strike, vigilance Whenever Agrus Kos enters or attacks, choose up to one target creature. If it's suspected, exile it. Otherwise, suspect it. (A suspected creature has menace and can't block.)