Black Priest Enki

Menace

At the beginning of your upkeep, create a Clue token.
Whenever you sacrifice a Clue, you may put a -1/-1 counter on up to one target creature.

Whenever a creature with a -1/-1 counter on it dies outside of combat, you may draw a card or create a 1/1 Skeleton creature token.

Whenever you cast a black instant or sorcery, you may
pay {b}. If you do, create a Clue token.