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

Sheets

Sheet nonfoil_rare_mythic

At rate 1/136 (0.74%)
Adaptive Automaton
Artificer's Dragon
Ashnod's Altar
Ashnod, Flesh Mechanist
Astral Cornucopia
Autonomous Assembler
Battlefield Forge
Blackblade Reforged
Blast Zone
Blast-Furnace Hellkite
Brotherhood's End
Brushland
Chromatic Lantern
Cloud Key
Deathbloom Ritualist
Defense Grid
Diabolic Intent
Disciple of Caelus Nin
Door to Nothingness
Drafna, Founder of Lat-Nam
Fade from History
Farid, Enterprising Salvager
Fateful Handoff
Fauna Shaman
Feldon, Ronom Excavator
Fortified Beachhead
Geology Enthusiast
Gilded Lotus
Gix's Command
Gixian Puppeteer
Glint Raker
Goblin Charbelcher
Gwenna, Eyes of Gaea
Hajar, Loyal Bodyguard
Hall of Tagsin
Harbin, Vanguard Aviator
Hexavus
Hostile Negotiations
Howling Mine
Hurkyl's Final Meditation
Inspiring Statuary
Journeyer's Kite
Kayla's Command
Kayla's Music Box
Kayla's Reconstruction
Keening Stone
Key to the City
Legions to Ashes
Liberator, Urza's Battlethopter
Llanowar Wastes
Lodestone Golem
Loran of the Third Path
Machine God's Effigy
March of Progress
Mazemind Tome
Mechanized Warfare
Misery's Shadow
Mishra's Command
Mishra's Foundry
Mishra, Tamer of Mak Fawa
Over the Top
Painful Quandary
Perennial Behemoth
Phyrexian Revoker
Precursor Golem
Psychosis Crawler
Queen Kayla bin-Kroog
Quicksilver Amulet
Quietus Spike
Razorlash Transmogrant
Rescue Retriever
Runechanter's Pike
Sanwell, Avenger Ace
Sardian Avenger
Scavenged Brawler
Scholar of New Horizons
Scrap Trawler
Sculpting Steel
Semblance Anvil
Siege Veteran
Simian Simulacrum
Skystrike Officer
Smelting Vat
Soul Partition
Staff of Titania
Steel Seraph
Sword of the Meek
Tawnos, the Toymaker
Teething Wurmlet
Terisian Mindbreaker
Terisiare's Devastation
Terror Ballista
The Archimandrite
The Stasis Coffin
The Stone Brain
The Temporal Anchor
Thopter Shop
Thorn of Amethyst
Thran Spider
Titania's Command
Tocasia's Welcome
Tocasia, Dig Site Mentor
Transmogrant's Crown
Tyrant of Kher Ridges
Underground River
Unwinding Clock
Urza's Command
Urza's Workshop
Urza, Prince of Kroog
Visions of Phyrexia
Well of Lost Dreams
Wire Surgeons
Wondrous Crucible
Woodcaller Automaton
Wreck Hunter
At rate 1/272 (0.37%)
Aetherflux Reservoir
Altar of Dementia
Arcane Proxy
Ashnod the Uncaring
Awaken the Woods
Bladecoil Serpent
Caged Sun
Cityscape Leveler
Clay Champion
Draconic Destiny
Gix, Yawgmoth Praetor
Helm of the Host
Hurkyl, Master Wizard
In the Trenches
Mesmeric Orb
Mind's Eye
Mishra, Eminent One
Mox Amber
Myrel, Shield of Argive
Mystic Forge
One with the Multiverse
Perilous Vault
Phyrexian Fleshgorger
Phyrexian Processor
Platinum Angel
Platoon Dispenser
Portal to Phyrexia
Ramos, Dragon Engine
Rootpath Purifier
Rootwire Amalgam
Saheeli, Filigree Master
Sarinth Greatwurm
Skitterbeam Battalion
Staff of Domination
Sundering Titan
Surge Engine
Tawnos, Solemn Survivor
Teferi, Temporal Pilgrim
Titania, Nature's Force
Urza's Sylex
Urza, Chief Artificer
Wurmcoil Engine

Sheet foil_uncommon_retro_artifact

At rate 5/108 (4.63%)
Bone Saw
Burnished Hart
Chromatic Star
Elsewhere Flask
Foundry Inspector
Ichor Wellspring
Ivory Tower
Jalum Tome
Liquimetal Coating
Millstone
Mishra's Bauble
Ornithopter
Pristine Talisman
Self-Assembler
Sigil of Valor
Soul-Guide Lantern
Springleaf Drum
Swiftfoot Boots
At rate 1/108 (0.93%)
Bone Saw
Burnished Hart
Chromatic Star
Elsewhere Flask
Foundry Inspector
Ichor Wellspring
Ivory Tower
Jalum Tome
Liquimetal Coating
Millstone
Mishra's Bauble
Ornithopter
Pristine Talisman
Self-Assembler
Sigil of Valor
Soul-Guide Lantern
Springleaf Drum
Swiftfoot Boots

Sheet foil_rare_mythic

At rate 1/120 (0.83%)
Adaptive Automaton
Artificer's Dragon
Ashnod's Altar
Ashnod, Flesh Mechanist
Astral Cornucopia
Autonomous Assembler
Battlefield Forge
Blackblade Reforged
Blast Zone
Brotherhood's End
Brushland
Chromatic Lantern
Cloud Key
Deathbloom Ritualist
Defense Grid
Diabolic Intent
Disciple of Caelus Nin
Door to Nothingness
Drafna, Founder of Lat-Nam
Fade from History
Fateful Handoff
Fauna Shaman
Feldon, Ronom Excavator
Fortified Beachhead
Geology Enthusiast
Gilded Lotus
Gix's Command
Gixian Puppeteer
Goblin Charbelcher
Gwenna, Eyes of Gaea
Hajar, Loyal Bodyguard
Hall of Tagsin
Harbin, Vanguard Aviator
Hostile Negotiations
Howling Mine
Hurkyl's Final Meditation
Inspiring Statuary
Journeyer's Kite
Kayla's Command
Kayla's Reconstruction
Keening Stone
Key to the City
Legions to Ashes
Liberator, Urza's Battlethopter
Llanowar Wastes
Lodestone Golem
Loran of the Third Path
Mazemind Tome
Mechanized Warfare
Misery's Shadow
Mishra's Command
Mishra's Foundry
Mishra, Tamer of Mak Fawa
Over the Top
Painful Quandary
Perennial Behemoth
Phyrexian Revoker
Precursor Golem
Psychosis Crawler
Queen Kayla bin-Kroog
Quicksilver Amulet
Quietus Spike
Razorlash Transmogrant
Rescue Retriever
Runechanter's Pike
Sardian Avenger
Scrap Trawler
Sculpting Steel
Semblance Anvil
Siege Veteran
Simian Simulacrum
Skystrike Officer
Soul Partition
Staff of Titania
Steel Seraph
Sword of the Meek
Tawnos, the Toymaker
Teething Wurmlet
Terisian Mindbreaker
Terror Ballista
The Archimandrite
The Stasis Coffin
The Stone Brain
The Temporal Anchor
Thorn of Amethyst
Thran Spider
Titania's Command
Tocasia's Welcome
Tocasia, Dig Site Mentor
Transmogrant's Crown
Tyrant of Kher Ridges
Underground River
Unwinding Clock
Urza's Command
Urza's Workshop
Urza, Prince of Kroog
Visions of Phyrexia
Well of Lost Dreams
Woodcaller Automaton
At rate 1/240 (0.42%)
Aetherflux Reservoir
Altar of Dementia
Arcane Proxy
Ashnod the Uncaring
Awaken the Woods
Bladecoil Serpent
Caged Sun
Cityscape Leveler
Clay Champion
Draconic Destiny
Gix, Yawgmoth Praetor
Helm of the Host
Hurkyl, Master Wizard
In the Trenches
Mesmeric Orb
Mind's Eye
Mishra, Eminent One
Mox Amber
Myrel, Shield of Argive
Mystic Forge
One with the Multiverse
Perilous Vault
Phyrexian Fleshgorger
Phyrexian Processor
Platinum Angel
Platoon Dispenser
Portal to Phyrexia
Ramos, Dragon Engine
Rootpath Purifier
Rootwire Amalgam
Saheeli, Filigree Master
Sarinth Greatwurm
Skitterbeam Battalion
Staff of Domination
Sundering Titan
Surge Engine
Tawnos, Solemn Survivor
Teferi, Temporal Pilgrim
Titania, Nature's Force
Urza's Sylex
Urza, Chief Artificer
Wurmcoil Engine