Teysa, Opulent Oligarch is a rare Legendary Creature — Human Advisor card from Murders at Karlov Manor (MKM), collector number 234. Current market price: $0.30 (foil $0.33), TCGplayer market prices via Scryfall.
Deathtouch At the beginning of your end step, investigate for each opponent who lost life this turn. Whenever a Clue you control is put into a graveyard from the battlefield, create a 1/1 white and black Spirit creature token with flying. This ability triggers only once each turn.