Magic 2015 Seeded Prerelease Booster Ambition has no variants:
Explore this pack in Sealed.

Sheets

Sheet common

At rate 1/25 (4.0%)
Accursed Spirit
Black Cat
Bronze Sable
Carrion Crow
Child of Night
Covenant of Blood
Crippling Blight
Eternal Thirst
Evolving Wilds
Festergloom
Flesh to Dust
Mind Rot
Necrobite
Necromancer's Assistant
Ornithopter
Radiant Fountain
Rotfeaster Maggot
Shadowcloak Vampire
Sign in Blood
Typhoid Rats
Tyrant's Machine
Unmake the Graves
Will-Forged Golem
Witch's Familiar
Zof Shade

Sheet uncommon

At rate 1/27 (3.7%)
Blood Host
Brawler's Plate
Caustic Tar
Darksteel Citadel
Endless Obedience
Feast on the Fallen
Gargoyle Sentinel
Gravedigger
Hot Soup
Juggernaut
Leeching Sliver
Meteorite
Necrogen Scudder
Paragon of Open Graves
Profane Memento
Rogue's Gloves
Sacred Armory
Stab Wound
Staff of the Death Magus
Staff of the Flame Magus
Staff of the Mind Magus
Staff of the Sun Magus
Staff of the Wild Magus
Tormod's Crypt
Ulcerate
Wall of Limbs
Xathrid Slyblade

Sheet rare_mythic

At rate 1/21 (4.76%)
Avarice Amulet
Cruel Sadist
Grindclock
Haunted Plate Mail
In Garruk's Wake
Indulgent Tormentor
Liliana Vess
Necromancer's Stockpile
Ob Nixilis, Unshackled
Obelisk of Urd
Perilous Vault
Phyrexian Revoker
Scuttling Doom Engine
Shield of the Avatar
Sliver Hive
Soul of Innistrad
Soul of New Phyrexia
Stain the Mind
The Chain Veil
Urborg, Tomb of Yawgmoth
Waste Not

Sheet promo

At rate 1/1 (100.0%)
Indulgent Tormentor