War of the Spark

Dreadmalkin | Creature | Zombie Cat | Menace (This creature can't be blocked except by two or more creatures.) {2}{B}, Sacrifice another creature or planeswalker: Put two +1/+1 counters on Dreadmalkin. | Aaron Miller

Eternal Taskmaster | Creature | Zombie | Eternal Taskmaster enters the battlefield tapped. Whenever Eternal Taskmaster attacks, you may pay {2}{B}. If you do, return target creature card from your graveyard to your hand. | Tomasz Jedruszek

Vizier of the Scorpion | Creature | Zombie Wizard | When Vizier of the Scorpion enters the battlefield, amass 1. (Put a +1/+1 counter on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.) Zombie tokens you control have deathtouch. | Zack Stella

Cruel Celebrant | Creature | Vampire | Whenever Cruel Celebrant or another creature or planeswalker you control dies, each opponent loses 1 life and you gain 1 life. | Bastien L. Deharme

Gleaming Overseer | Creature | Zombie Wizard | When Gleaming Overseer enters the battlefield, amass 1. (Put a +1/+1 counter on an Army you control. If you don't control one, create a 0/0 black Zombie Army creature token first.) Zombie tokens you control have hexproof and menace. | Volkan Baǵa

Mayhem Devil | Creature | Devil | Whenever a player sacrifices a permanent, Mayhem Devil deals 1 damage to any target. | Dmitry Burmak

Leyline Prowler | Creature | Nightmare Beast | Deathtouch, lifelink {T}: Add one mana of any color. | YW Tang