War of the Spark Theme Booster Black has variants:
Explore this pack in Sealed.

Sheets

Sheet uncommon (duplicates allowed)

At rate 4/57 (7.02%)
Angrath, Captain of Chaos
Ashiok, Dream Render
Bleeding Edge
Bond of Revival
Davriel, Rogue Shadowmage
Dreadmalkin
Eternal Taskmaster
Kaya, Bane of the Dead
Liliana's Triumph
Ob Nixilis, the Hate-Twisted
Price of Betrayal
Vizier of the Scorpion
Vraska, Swarm's Eminence
At rate 1/57 (1.75%)
Emergence Zone
Firemind Vessel
God-Pharaoh's Statue
Interplanar Beacon
Ugin's Conjurant

Sheet common (duplicates allowed)

At rate 2/41 (4.88%)
Aid the Fallen
Banehound
Charity Extractor
Davriel's Shadowfugue
Duskmantle Operative
Herald of the Dreadhorde
Kaya's Ghostform
Lazotep Behemoth
Lazotep Reaver
Ob Nixilis's Cruelty
Shriekdiver
Sorin's Thirst
Spark Harvest
Spark Reaper
Tithebearer Giant
Toll of the Invasion
Unlikely Aid
Vampire Opportunist
Vraska's Finisher
At rate 1/82 (1.22%)
Gateway Plaza
Guild Globe
Iron Bully
Mana Geode
Prismite
Saheeli's Silverwing

Sheet rare_mythic

At rate 4/35 (11.43%)
Bolas's Citadel
Command the Dreadhorde
Deliver Unto Evil
Dreadhorde Invasion
Massacre Girl
The Elderspell
At rate 2/35 (5.71%)
Finale of Eternity
God-Eternal Bontu
Liliana, Dreadhorde General
At rate 1/35 (2.86%)
Blast Zone
Karn's Bastion
Karn, the Great Creator
Mobilized District
Ugin, the Ineffable