The Brothers' War Jumpstart Booster has variants:
Explore this pack in Sealed.

Sheets

Sheet infantry_1 (fixed content without randomization)

At count 6x
Plains
At count 1x
Aeronaut Cavalry
Airlift Chaplain
Lay Down Arms
Phalanx Vanguard
Recommission
Reconstructed Thopter
Recruitment Officer
Rescue Retriever
Static Net
Veteran's Powerblade
Warlord's Elite

Sheet infantry_1_foils (fixed content without randomization)

At count 2x
Plains

Sheet rare_mythic_white

At rate 1/10 (10.0%)
Autonomous Assembler
Kayla's Command
Kayla's Reconstruction
Loran of the Third Path
Siege Veteran
Soul Partition
Steel Seraph
Tocasia's Welcome
At rate 1/20 (5.0%)
In the Trenches
Myrel, Shield of Argive
Platoon Dispenser
Urza's Sylex

Sheet infantry_2 (fixed content without randomization)

At count 6x
Plains
At count 1x
Aeronaut Cavalry
Ambush Paratrooper
Lay Down Arms
Phalanx Vanguard
Rescue Retriever
Scrapwork Cohort
Static Net
Thopter Architect
Veteran's Powerblade
Warlord's Elite
Yotian Frontliner

Sheet infantry_2_foils (fixed content without randomization)

At count 2x
Plains

Sheet powerstones_1 (fixed content without randomization)

At count 6x
Island
At count 1x
Combat Courier
Geology Enthusiast
Koilos Roc
Spotter Thopter
Stern Lesson
Take Flight
Third Path Savant
Thopter Mechanic
Urza's Rebuff
Urza, Powerstone Prodigy
Weakstone's Subjugation

Sheet powerstones_1_foils (fixed content without randomization)

At count 2x
Island

Sheet rare_mythic_blue

At rate 1/9 (11.11%)
Drafna, Founder of Lat-Nam
Hurkyl's Final Meditation
Hurkyl, Master Wizard
Skystrike Officer
Terisian Mindbreaker
The Temporal Anchor
Urza's Command
At rate 1/18 (5.56%)
Arcane Proxy
One with the Multiverse
Surge Engine
Teferi, Temporal Pilgrim

Sheet powerstones_2 (fixed content without randomization)

At count 6x
Island
At count 1x
Combat Courier
Geology Enthusiast
Hulking Metamorph
Involuntary Cooldown
Koilos Roc
Lat-Nam Adept
Mightstone's Animation
Stern Lesson
Thopter Mechanic
Urza, Powerstone Prodigy
Weakstone's Subjugation

Sheet powerstones_2_foils (fixed content without randomization)

At count 2x
Island

Sheet titanic_1 (fixed content without randomization)

At count 6x
Forest
At count 1x
Argothian Opportunist
Blanchwood Prowler
Bushwhack
Cradle Clearcutter
Gaea's Gift
Giant Growth
Iron-Craw Crusher
Rust Goliath
Sarinth Steelseeker
Shoot Down
Woodcaller Automaton

Sheet titanic_1_foils (fixed content without randomization)

At count 2x
Forest

Sheet rare_mythic_green

At rate 2/19 (10.53%)
Argoth, Sanctum of Nature
Titania, Gaea Incarnate
Fade from History
Fauna Shaman
Gwenna, Eyes of Gaea
Perennial Behemoth
Simian Simulacrum
Teething Wurmlet
Titania's Command
At rate 1/19 (5.26%)
Awaken the Woods
Rootwire Amalgam
Titania, Voice of Gaea
Titania, Gaea Incarnate

Sheet titanic_2 (fixed content without randomization)

At count 6x
Forest
At count 1x
Argothian Sprite
Bushwhack
Cradle Clearcutter
Epic Confrontation
Iron-Craw Crusher
Perimeter Patrol
Rust Goliath
Sarinth Steelseeker
Shoot Down
Tawnos's Tinkering
Woodcaller Automaton

Sheet titanic_2_foils (fixed content without randomization)

At count 2x
Forest

Sheet unearthed_1 (fixed content without randomization)

At count 6x
Swamp
At count 1x
Ashnod's Harvester
Ashnod's Intervention
Clay Revenant
Go for the Throat
Gruesome Realization
Kill-Zone Acrobat
No One Left Behind
Ravenous Gigamole
Scrapwork Rager
Terror Ballista
Thraxodemon

Sheet unearthed_1_foils (fixed content without randomization)

At count 2x
Swamp

Sheet rare_mythic_black

At rate 1/11 (9.09%)
Ashnod, Flesh Mechanist
Diabolic Intent
Fateful Handoff
Gix's Command
Gixian Puppeteer
Hostile Negotiations
Misery's Shadow
Painful Quandary
Razorlash Transmogrant
Transmogrant's Crown
At rate 1/22 (4.55%)
Gix, Yawgmoth Praetor
Phyrexian Fleshgorger

Sheet unearthed_2 (fixed content without randomization)

At count 6x
Swamp
At count 1x
Ashnod's Harvester
Dredging Claw
Gixian Skullflayer
Gnawing Vermin
Gruesome Realization
Overwhelming Remorse
Ravenous Gigamole
Scrapwork Rager
Terror Ballista
Thraxodemon
Transmogrant Altar

Sheet unearthed_2_foils (fixed content without randomization)

At count 2x
Swamp

Sheet welded_1 (fixed content without randomization)

At count 6x
Mountain
At count 1x
Artificer's Dragon
Bitter Reunion
Fallaji Chaindancer
Fallaji Dragon Engine
Horned Stoneseeker
Mishra's Juggernaut
Mishra, Excavation Prodigy
Obliterating Bolt
Scrapwork Mutt
Unleash Shell
Whirling Strike

Sheet welded_1_foils (fixed content without randomization)

At count 2x
Mountain

Sheet rare_mythic_red

At rate 1/9 (11.11%)
Brotherhood's End
Feldon, Ronom Excavator
Mechanized Warfare
Mishra's Command
Over the Top
Phyrexian Dragon Engine
Mishra, Lost to Phyrexia
Tyrant of Kher Ridges
Visions of Phyrexia
At rate 1/18 (5.56%)
Draconic Destiny
Skitterbeam Battalion

Sheet welded_2 (fixed content without randomization)

At count 6x
Mountain
At count 1x
Artificer's Dragon
Excavation Explosion
Fallaji Dragon Engine
Horned Stoneseeker
Mishra's Juggernaut
Mishra's Onslaught
Mishra's Research Desk
Mishra, Excavation Prodigy
Scrapwork Mutt
Tomakul Scrapsmith
Unleash Shell

Sheet welded_2_foils (fixed content without randomization)

At count 2x
Mountain