Teysa, Opulent Oligarch (Serial Numbered) (MKM-321) - Murders at Karlov Manor Foil

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.