War of the Spark

Aven Eternal | Creature | Zombie Bird Warrior | Flying When Aven Eternal 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.) | Johan Grenier

Flux Channeler | Creature | Human Wizard | Whenever you cast a noncreature spell, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.) | Heonhwa Choe

Naga Eternal | Creature | Zombie Naga | | Johann Bodin

Spellkeeper Weird | Creature | Weird | {2}, {T}, Sacrifice Spellkeeper Weird: Return target instant or sorcery card from your graveyard to your hand. | James Paick

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