Vyla, Coven Matriarch

Whenever a non-token creature you control dies, you may pay 1 life and exile that creature. If you do, create a 1/1 black Skeleton creature token with "When this creature dies, it deals 1 damage to any target."

At the beginning of your upkeep, if there are five or more creature cards exiled with Vyla, return a creature card exiled with Vyla to the battlefield. It gains haste and "At the beginning of the end step, sacrifice this creature."