Midnight Banshee

Trample

At the beginning of your upkeep, put a +1/+1 counter on each creature each opponent controls.

At the beginning of your upkeep, each player sacrifices a non-Vampire creature of their choice.

Flying

At the beginning of your upkeep, you may sacrifice a nonartifact creature. If you do, put a +1/+1 counter on this creature. If you don't, tap this creature.

When this creature enters, create a 5/5 black Demon creature token with flying.

At the beginning of your upkeep, you lose 2 life.

At the beginning of each opponent's upkeep, they lose 1 life and you put a -1/-1 counter on up to one target creature they control.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

At the beginning of your upkeep, you may pay 1 life. If you do, draw a card and put a +1/+1 counter on Seymour Flux.