Mirko, Obsessive Theorist (Murders at Karlov Manor Commander)

Legendary Creature Ñ Vampire Detective - Flying, vigilance
Whenever you surveil, put a +1/+1 counter on Mirko.
At the beginning of your end step, you may return target creature card with power less than Mirko's from your graveyard to the battlefield with a finality counter on it. (If it would die, exile it instead.)