Yu-Gi-Oh! archetype
Every Alien card
The Alien archetype has 40 cards: 23 monsters, 8 Spells and 9 Traps. The first was printed in 2006 and the newest in 2023. The most valuable is Cosmic Fortress Gol'gar, with a printing at $34.96.
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40 cards

"A" Cell Breeding Device
Spell Card (2007)
from $0.14

"A" Cell Incubator
Spell Card (2007)
from $0.18

"A" Cell Recombination Device
Spell Card (2016)
from $0.11

"A" Cell Scatter Burst
Spell Card (2007)
from $0.19

Alien Ammonite
Tuner Monster (2009)
from $0.90

Alien Brain
Trap Card (2010)
from $0.11

Alien Dog
Effect Monster (2009)
from $0.40

Alien Grey
Flip Effect Monster (2006)
from $0.25

Alien Hunter
Effect Monster (2006)
from $0.16

Alien Hypno
Gemini Monster (2007)
from $0.50

Alien Infiltrator
Effect Monster (2006)
from $0.12

Alien Kid
Effect Monster (2009)
from $9.19

Alien Mars
Effect Monster (2006)
from $0.20

Alien Mother
Effect Monster (2006)
from $0.46

Alien Overlord
Effect Monster (2009)
from $0.94

Alien Psychic
Effect Monster (2007)
from $0.13

Alien Shocktrooper
Normal Monster (2007)
from $0.70

Alien Shocktrooper M-Frame
Link Monster (2020)
from $1.59

Alien Skull
Effect Monster (2006)
from $0.16

Alien Stealthbuster
Effect Monster (2021)
from $0.91

Alien Telepath
Effect Monster (2007)
from $4.87

Alien Warrior
Effect Monster (2006)
from $2.07

Brainwashing Beam
Trap Card (2006)
from $0.12

Cell Explosion Virus
Trap Card (2007)
from $0.40

Code A Ancient Ruins
Spell Card (2009)
from $5.10

Corruption Cell "A"
Spell Card (2006)
from $0.11

Cosmic Fortress Gol'gar
Synchro Monster (2009)
from $34.96

Cosmic Horror Gangi'el
Effect Monster (2006)
from $0.30

Cosmic Slicer Zer'oll
Link Monster (2021)
from $0.93

Crop Circles
Trap Card (2006)
from $0.16

Detonator Circle "A"
Trap Card (2007)
from $0.36

Flying Saucer Muusik'i
Effect Monster (2006)
from $0.12

I.A.S. -Invasive Alien Species-
Effect Monster (2023)
from $0.16

Interdimensional Warp
Trap Card (2007)
from $0.13

Interplanetary Invader "A"
Effect Monster (2008)
from $0.10

Mass Hypnosis
Trap Card (2007)
from $0.17

Mysterious Triangle
Spell Card (2009)
from $0.39

Orbital Bombardment
Trap Card (2006)
from $0.11

Otherworld - The "A" Zone
Spell Card (2007)
from $0.20

Planet Pollutant Virus
Trap Card (2009)
from $0.23