Unstable Draft Booster has variants:
Explore this pack in Sealed.

Sheets

Sheet basic

At rate 24/121 (19.83%)
Forest
Island
Mountain
Plains
Swamp
At rate 1/121 (0.83%)
Steamflogger Boss

Sheet contraption

At rate 8/205 (3.9%)
Applied Aeronautics
Auto-Key
Boomflinger
Buzz Buggy
Dictation Quillograph
Division Table
Head Banger
Inflation Station
Lackey Recycler
Mandatory Friendship Shackles
Quick-Stick Lick Trick
Sap Sucker
Top-Secret Tunnel
Tread Mill
Twiddlestick Charger
At rate 4/205 (1.95%)
Accessories to Murder
Arms Depot
Dispatch Dispensary
Dogsnail Engine
Genetic Recombinator
Gnomeball Machine
Insufferable Syphon
Jamming Device
Neural Network
Optical Optimizer
Sundering Fork
Targeting Rocket
Thud-for-Duds
Turbo-Thwacking Auto-Hammer
Widget Contraption
At rate 2/205 (0.98%)
Deadly Poison Sampler
Dual Doomsuits
Duplication Device
Gift Horse
Goblin Slingshot
Guest List
Hypnotic Swirly Disc
Oaken Power Suit
Record Store
Refibrillator
At rate 1/205 (0.49%)
Bee-Bee Gun
Faerie Aerie
Hard Hat Area
Pet Project
Rapid Prototyper

Sheet common

At rate 4/241 (1.66%)
Adorable Kitten
Big Boa Constrictor
Blurry Beeble
Box of Free-Range Goblins
Bumbling Pangolin
Chipper Chopper
Chivalrous Chevalier
Common Iguana
Crafty Octopus
Defective Detective
Dirty Rat
Eager Beaver
Feisty Stegosaurus
Finders, Keepers
GO TO JAIL
Gnome-Made Engine
Ground Pounder
Hammer Helper
Hazmat Suit (Used)
Hoisted Hireling
Humming-
It That Gets Left Hanging
Joyride Rigger
Just Desserts
Mad Science Fair Project
Magic Word
Mer Man
Mother Kangaroo
Multi-Headed
Numbing Jellyfish
Old Guard
Ordinary Pony
Painiac
Really Epic Punch
Riveting Rigger
Sacrifice Play
Selfie Preservation
Shaggy Camel
Snickering Squirrel
Spell Suck
Squirrel Dealer
Steady-Handed Mook
Stinging Scorpion
Subcontract
Success!
Time Out
Voracious Vacuum
Wall of Fortune
Wild Crocodile
Willing Test Subject
Work a Double
Wrench-Rigger
capital offense
At rate 1/241 (0.41%)
Amateur Auteur
Amateur Auteur
Amateur Auteur
Amateur Auteur
Beast in Show
Beast in Show
Beast in Show
Beast in Show
Curious Killbot
Delighted Killbot
Despondent Killbot
Enraged Killbot
Extremely Slow Zombie
Extremely Slow Zombie
Extremely Slow Zombie
Extremely Slow Zombie
Novellamental
Novellamental
Novellamental
Novellamental
Secret Base
Secret Base
Secret Base
Secret Base
Secret Base
Target Minotaur
Target Minotaur
Target Minotaur
Target Minotaur

Sheet uncommon

At rate 1/60 (1.67%)
"Rumors of My Death . . ."
Aerial Toastmaster
Border Guardian
Buzzing Whack-a-Doodle
Chittering Doom
Clever Combo
Clock of DOOOOOOOOOOOOM!
Cogmentor
Contraption Cannon
Crow Storm
Druid of the Sacred Beaker
Entirely Normal Armchair
First Pick
Five-Finger Discount
Gimme Five
Goblin Haberdasher
Half-Kitten, Half-
Half-Orc, Half-
Half-Shark, Half-
Half-Squirrel, Half-
Hammer Jammer
Hammerfest Boomtacular
Inhumaniac
Kindly Cognician
Knight of the Widget
Krark's Other Thumb
Labro Bot
Lobe Lobber
Midlife Upgrade
Monkey-
More or Less
Ninja
Old-Fashioned Vampire
Overt Operative
Party Crasher
Proper Laboratory Attire
Rhino-
Robo-
S.N.E.A.K. Dispatcher
Shellephant
Side Quest
Skull Saucer
Slaying Mantis
Socketed Sprocketer
Spy Eye
Squirrel-Powered Scheme
Staff of the Letter Magus
Stamp of Approval
Steam-Powered
Steamflogger Service Rep
Steamflogger Temp
Steamfloggery
Steel Squirrel
Super-Duper Death Ray
Suspicious Nanny
Teacher's Pet
Zombified
At rate 1/360 (0.28%)
Garbage Elemental (a)
Garbage Elemental (b)
Garbage Elemental (c)
Garbage Elemental (d)
Garbage Elemental (e)
Garbage Elemental (f)
Knight of the Kitchen Sink (a)
Knight of the Kitchen Sink (b)
Knight of the Kitchen Sink (c)
Knight of the Kitchen Sink (d)
Knight of the Kitchen Sink (e)
Knight of the Kitchen Sink (f)
Sly Spy (a)
Sly Spy (b)
Sly Spy (c)
Sly Spy (d)
Sly Spy (e)
Sly Spy (f)

Sheet rare

At rate 1/40 (2.5%)
Angelic Rocket
Animate Library
As Luck Would Have It
Better Than One
By Gnome Means
Clocknapper
Cramped Bunker
Earl of Squirrel
Graveyard Busybody
Grusilda, Monster Masher
Handy Dandy Clone Machine
Hangman
Hot Fix
Hydradoodle
Incite Insight
Jackknight
Kindslaver
Mary O'Kill
Masterful Ninja
Modular Monstrosity
Oddly Uneven
Over My Dead Bodies
Rules Lawyer
Serpentine
Spike, Tournament Grinder
Split Screen
Steamflogger of the Month
The Big Idea
The Countdown Is at One
Three-Headed Goblin
Watermarket
X
At rate 1/80 (1.25%)
Baron Von Count
Do-It-Yourself Seraph
Dr. Julius Jumblemorph
Infinity Elemental
Ol' Buzzbark
Phoebe, Head of S.N.E.A.K.
Summon the Pack
Sword of Dungeons & Dragons
The Grand Calcutron
Urza, Academy Headmaster
At rate 1/240 (0.42%)
Everythingamajig (a)
Everythingamajig (b)
Everythingamajig (c)
Everythingamajig (d)
Everythingamajig (e)
Everythingamajig (f)
Ineffable Blessing (a)
Ineffable Blessing (b)
Ineffable Blessing (c)
Ineffable Blessing (d)
Ineffable Blessing (e)
Ineffable Blessing (f)
Very Cryptic Command (a)
Very Cryptic Command (b)
Very Cryptic Command (c)
Very Cryptic Command (d)
Very Cryptic Command (e)
Very Cryptic Command (f)

Sheet foil

At rate 12/1205 (1.0%)
Adorable Kitten
Big Boa Constrictor
Blurry Beeble
Box of Free-Range Goblins
Bumbling Pangolin
Chipper Chopper
Chivalrous Chevalier
Common Iguana
Crafty Octopus
Defective Detective
Dirty Rat
Eager Beaver
Feisty Stegosaurus
Finders, Keepers
GO TO JAIL
Gnome-Made Engine
Ground Pounder
Hammer Helper
Hazmat Suit (Used)
Hoisted Hireling
Humming-
It That Gets Left Hanging
Joyride Rigger
Just Desserts
Mad Science Fair Project
Magic Word
Mer Man
Mother Kangaroo
Multi-Headed
Numbing Jellyfish
Old Guard
Ordinary Pony
Painiac
Really Epic Punch
Riveting Rigger
Sacrifice Play
Selfie Preservation
Shaggy Camel
Snickering Squirrel
Spell Suck
Squirrel Dealer
Steady-Handed Mook
Stinging Scorpion
Subcontract
Success!
Time Out
Voracious Vacuum
Wall of Fortune
Wild Crocodile
Willing Test Subject
Work a Double
Wrench-Rigger
capital offense
At rate 1/240 (0.42%)
"Rumors of My Death . . ."
Aerial Toastmaster
Border Guardian
Buzzing Whack-a-Doodle
Chittering Doom
Clever Combo
Clock of DOOOOOOOOOOOOM!
Cogmentor
Contraption Cannon
Crow Storm
Druid of the Sacred Beaker
Entirely Normal Armchair
First Pick
Five-Finger Discount
Gimme Five
Goblin Haberdasher
Half-Kitten, Half-
Half-Orc, Half-
Half-Shark, Half-
Half-Squirrel, Half-
Hammer Jammer
Hammerfest Boomtacular
Inhumaniac
Kindly Cognician
Knight of the Widget
Krark's Other Thumb
Labro Bot
Lobe Lobber
Midlife Upgrade
Monkey-
More or Less
Ninja
Old-Fashioned Vampire
Overt Operative
Party Crasher
Proper Laboratory Attire
Rhino-
Robo-
S.N.E.A.K. Dispatcher
Shellephant
Side Quest
Skull Saucer
Slaying Mantis
Socketed Sprocketer
Spy Eye
Squirrel-Powered Scheme
Staff of the Letter Magus
Stamp of Approval
Steam-Powered
Steamflogger Service Rep
Steamflogger Temp
Steamfloggery
Steel Squirrel
Super-Duper Death Ray
Suspicious Nanny
Teacher's Pet
Zombified
At rate 3/800 (0.38%)
Angelic Rocket
Animate Library
As Luck Would Have It
Better Than One
By Gnome Means
Clocknapper
Cramped Bunker
Earl of Squirrel
Graveyard Busybody
Grusilda, Monster Masher
Handy Dandy Clone Machine
Hangman
Hot Fix
Hydradoodle
Incite Insight
Jackknight
Kindslaver
Mary O'Kill
Masterful Ninja
Modular Monstrosity
Oddly Uneven
Over My Dead Bodies
Rules Lawyer
Serpentine
Spike, Tournament Grinder
Split Screen
Steamflogger of the Month
The Big Idea
The Countdown Is at One
Three-Headed Goblin
Watermarket
X
At rate 3/1205 (0.25%)
Amateur Auteur
Amateur Auteur
Amateur Auteur
Amateur Auteur
Beast in Show
Beast in Show
Beast in Show
Beast in Show
Curious Killbot
Delighted Killbot
Despondent Killbot
Enraged Killbot
Extremely Slow Zombie
Extremely Slow Zombie
Extremely Slow Zombie
Extremely Slow Zombie
Novellamental
Novellamental
Novellamental
Novellamental
Secret Base
Secret Base
Secret Base
Secret Base
Secret Base
Target Minotaur
Target Minotaur
Target Minotaur
Target Minotaur
At rate 3/1600 (0.19%)
Baron Von Count
Do-It-Yourself Seraph
Dr. Julius Jumblemorph
Infinity Elemental
Ol' Buzzbark
Phoebe, Head of S.N.E.A.K.
Summon the Pack
Sword of Dungeons & Dragons
The Grand Calcutron
Urza, Academy Headmaster
At rate 1/1440 (0.07%)
Garbage Elemental (a)
Garbage Elemental (b)
Garbage Elemental (c)
Garbage Elemental (d)
Garbage Elemental (e)
Garbage Elemental (f)
Knight of the Kitchen Sink (a)
Knight of the Kitchen Sink (b)
Knight of the Kitchen Sink (c)
Knight of the Kitchen Sink (d)
Knight of the Kitchen Sink (e)
Knight of the Kitchen Sink (f)
Sly Spy (a)
Sly Spy (b)
Sly Spy (c)
Sly Spy (d)
Sly Spy (e)
Sly Spy (f)
At rate 1/1600 (0.06%)
Everythingamajig (a)
Everythingamajig (b)
Everythingamajig (c)
Everythingamajig (d)
Everythingamajig (e)
Everythingamajig (f)
Ineffable Blessing (a)
Ineffable Blessing (b)
Ineffable Blessing (c)
Ineffable Blessing (d)
Ineffable Blessing (e)
Ineffable Blessing (f)
Very Cryptic Command (a)
Very Cryptic Command (b)
Very Cryptic Command (c)
Very Cryptic Command (d)
Very Cryptic Command (e)
Very Cryptic Command (f)

Sheet basic_foil

At rate 24/121 (19.83%)
Forest
Island
Mountain
Plains
Swamp
At rate 1/121 (0.83%)
Steamflogger Boss

Sheet contraption_foil

At rate 8/205 (3.9%)
Applied Aeronautics
Auto-Key
Boomflinger
Buzz Buggy
Dictation Quillograph
Division Table
Head Banger
Inflation Station
Lackey Recycler
Mandatory Friendship Shackles
Quick-Stick Lick Trick
Sap Sucker
Top-Secret Tunnel
Tread Mill
Twiddlestick Charger
At rate 4/205 (1.95%)
Accessories to Murder
Arms Depot
Dispatch Dispensary
Dogsnail Engine
Genetic Recombinator
Gnomeball Machine
Insufferable Syphon
Jamming Device
Neural Network
Optical Optimizer
Sundering Fork
Targeting Rocket
Thud-for-Duds
Turbo-Thwacking Auto-Hammer
Widget Contraption
At rate 2/205 (0.98%)
Deadly Poison Sampler
Dual Doomsuits
Duplication Device
Gift Horse
Goblin Slingshot
Guest List
Hypnotic Swirly Disc
Oaken Power Suit
Record Store
Refibrillator
At rate 1/205 (0.49%)
Bee-Bee Gun
Faerie Aerie
Hard Hat Area
Pet Project
Rapid Prototyper