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

Sheets

Sheet uncommon (duplicates allowed)

At rate 4/57 (7.02%)
Angrath, Captain of Chaos
Bolt Bend
Bond of Passion
Chandra's Triumph
Cyclops Electromancer
Devouring Hellion
Dreadhorde Twins
Jaya, Venerated Firemage
Nahiri, Storm of Stone
Saheeli, Sublime Artificer
Samut, Tyrant Smasher
Tibalt's Rager
Tibalt, Rakish Instigator
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%)
Ahn-Crop Invader
Blindblast
Burning Prophet
Chainwhip Cyclops
Chandra's Pyrohelix
Demolish
Goblin Assailant
Goblin Assault Team
Grim Initiate
Heartfire
Honor the God-Pharaoh
Invading Manticore
Jaya's Greeting
Nahiri's Stoneblades
Raging Kronch
Samut's Sprint
Sarkhan's Catharsis
Spellgorger Weird
Turret Ogre
At rate 1/82 (1.22%)
Gateway Plaza
Guild Globe
Iron Bully
Mana Geode
Prismite
Saheeli's Silverwing

Sheet rare_mythic

At rate 4/33 (12.12%)
Chandra, Fire Artisan
Dreadhorde Arcanist
Krenko, Tin Street Kingpin
Mizzium Tank
Neheb, Dreadhorde Champion
Sarkhan the Masterless
At rate 2/33 (6.06%)
Finale of Promise
Ilharg, the Raze-Boar
At rate 1/33 (3.03%)
Blast Zone
Karn's Bastion
Karn, the Great Creator
Mobilized District
Ugin, the Ineffable