Draug
Skellige (Ard Skellig), Gwent Quest: Gwent: Skellige Style, won from Crach an Craite of Kaer Trolde.
Imlerith
Won from a Gwent Player, Reward for beating an opponent (random).
Leshen
Skellige (Ard Skellig), Gwent Quest: Gwent: Skellige Style, won from Ermion the Druid of Kaer Trolde.
Kayran
Won from a Gwent Player, Reward for beating an opponent (random).
Toad
Won from a Gwent Player, Novigrad (Oxenfurt City), Reward for beating Olgierd von Everec, at the Alchemy Inn.
Earth Elemental
Purchased from Trader (20 Crowns), Skellige (Ard Skellig), Jonas the Innkeep of the New Port Inn, Kaer Trolde Harbor.
Fiend
Purchased from Trader (20 Crowns), Skellige (Ard Skellig), The Innkeep of Arinbjorn.
Fire Elemental
Won from a Gwent Player, Reward for beating an opponent (random).
Arachas Behemoth
Won from a Gwent Player, Reward for beating an opponent (random).
Crone: Brewess
Won from a Gwent Player, Reward for beating an opponent (random).
Crone: Weavess
Velen (The Descent), Gwent Quest: Velen Players, won from The Old Sage of Benek.
Crone: Whispess
Purchased from Trader (20 Crowns), Skellige (Ard Skellig), The Innkeep of Arinbjorn.
Forktail
Won from a Gwent Player, Reward for beating an opponent (random).
Plague Maiden
Won from a Gwent Player, Reward for beating an opponent (random).
Griffin
Won from a Gwent Player, Reward for beating an opponent (random).
Werewolf
Purchased from Trader (20 Crowns), Skellige (An Skellig), The Innkeep of Urialla Harbor.
Frightener
Won from a Gwent Player, Reward for beating an opponent (random).
Ice Giant
Purchased from Trader (10 Crowns), Skellige (Spikeroog), The Innkeep of Svorlag.
Grave Hag
Won from a Gwent Player, Reward for beating an opponent (random).
Vampire: Katakan
Skellige (Ard Skellig), Gwent Quest: Gwent: Skellige Style, won from Jarl “Madman” Lugos of Kaer Muire (or Kaer Trolde).
Botchling
Purchased from Trader (10 Crowns), Skellige (Ard Skellig), Jonas the Innkeep of the New Port Inn, Kaer Trolde Harbor.
Arachas
Purchased from Trader (20 Crowns), Skellige (Ard Skellig), The Innkeep of Arinbjorn.
Arachas
Purchased from Trader (20 Crowns), Skellige (An Skellig), The Innkeep of Urialla Harbor.
Arachas
Purchased from Trader (50 Crowns), Skellige (Spikeroog), The Innkeep of Svorlag.
Vampire: Ekimmara
Purchased from Trader (20 Crowns), Skellige (Spikeroog), The Innkeep of Svorlag.
Vampire: Fleder
Purchased from Trader (50 Crowns), Skellige (Faroe), The Innkeep of Harviken.
Vampire: Garkain
Won from a Gwent Player, Reward for beating an opponent (random).
Vampire: Bruxa
Novigrad (Gustfields), Secondary Quest: A Matter of Life and Death, won from Count Gomo Seeling, the Gwent Players of Vegelbud Estate. 
OR as a reward from the garden chest, during Blood and Wine Secondary Quest: Till Death Do You Part.
Endrega
Won from a Gwent Player, Reward for beating an opponent (random).
Harpy
Purchased from Trader (20 Crowns), Skellige (Faroe), The Innkeep of Harviken.
Cockatrice
Won from a Gwent Player, Reward for beating an opponent (random).
Gargoyle
Won from a Gwent Player, Reward for beating an opponent (random).
Celaeno Harpy
Won from a Gwent Player, Reward for beating an opponent (random).
Foglet
Purchased from Trader (10 Crowns), Skellige (Spikeroog), The Innkeep of Svorlag.
Wyvern
Won from a Gwent Player, Reward for beating an opponent (random).
Nekker
Faroe, Secondary Quest: Following the Thread, found on the corpse of Hammond the Skelliger during this quest.
Nekker
Purchased from Trader (10 Crowns), Skellige (Faroe), The Innkeep of Harviken.
Nekker
Won from a Gwent Player, Reward for beating an opponent (random).
Ghoul
Purchased from Trader (10 Crowns), Skellige (Faroe). The Innkeep of Harviken.
Ghoul
Won from a Gwent Player, Reward for beating an opponent (random).
Ghoul
Won from a Gwent Player, Reward for beating an opponent (random).