LIGHT 3

When you Normal Summon an "Alien" monster, you can Special Summon this card from your hand. When you do, place 2 A-Counters on face-up monster(s) your opponent controls.

LIGHT 4

If this card is sent to the GY: You can target 1 face-up monster on the field; place 2 A-Counters on it. During your Main Phase, except the turn this card was sent to the GY: You can banish this card from your GY, then target 1 card with an A-Counter; destroy it. You can only use each effect of "Alien Stealthbuster" once per turn.

DARK 3

If you control a Reptile monster, you can Special Summon this card (from your hand). You can only Special Summon "Black Mamba" once per turn this way. If this card is Normal or Special Summoned: You can target 1 monster your opponent controls; send 1 Reptile monster from your Deck to the GY, and if you do, change the targeted monster's battle position. You can only use this effect of "Black Mamba" once per turn.

LIGHT 7

If you're Tributing a monster on your side of the field that is owned by your opponent, this card can be Normal Summoned with 1 Tribute. Once per turn, you can place 1 A-Counter on a monster on your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)

DARK 8

You can Tribute Summon this card by Tributing 1 Reptile monster. When this card is Tribute Summoned: You can Special Summon "Alligator Tokens" (Reptile/DARK/Level 1/ATK 2000/DEF 0), up to the number of Reptile monsters Tributed for this card's Summon. If this Tribute Summoned card is destroyed by battle, or is destroyed by an opponent's card effect while in its owner's Monster Zone: You can add 1 Reptile monster from your Deck to your hand, except "Dark Alligator".

DARK 8

This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by removing from play all Reptile-Type monsters from your side of the field and Graveyard. This card's ATK and DEF are each equal to the number of monsters you removed x 600. During each of your End Phases, destroy 1 card on the field.

LIGHT 4

Cannot be destroyed by battle or card effects while your opponent has a face-up card in their Field Zone. You can only use each of the following effects of "I.A.S. -Invasive Alien Species-" once per turn. If your opponent has a face-up card in their Field Zone: You can target 1 monster they control; destroy it, and if you do, this card gains 1000 ATK. If your opponent has a face-up card in their Field Zone, while this card is in your GY: You can Special Summon this card.

DARK 4

If this card is Normal or Special Summoned: You can add 1 Level 8 Reptile monster from your Deck to your hand. If this card is banished: You can target 1 Reptile monster you control; it cannot be destroyed by card effects until the end of the next turn. You can only use each effect of "Lamia" once per turn.

DARK 8

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand or GY) by paying half your LP, while your opponent has a Monster Card in their field or GY with an effect that activates in the hand or Monster Zone in response to a card or effect activation. You can only Special Summon "Liberator Eto" once per turn this way. This card's Special Summon cannot be negated. This face-up card cannot be used as material for a Fusion, Synchro, Xyz, or Link Summon, also during your turn only, it is unaffected by monster effects activated on your opponent's field.

WATER 4

If this card is sent to the GY by a card effect: You can Special Summon this card, but banish it when it leaves the field. You can only use this effect of "Night Sword Serpent" once per turn.

LIGHT 2

You can banish this card from your Graveyard; take 1 Xyz Material from a monster your opponent controls and attach it to an Xyz Monster you control as Xyz Material.

EARTH 8

You can only use each of the following effects of "Therion "Empress" Alasia" once per turn. ● You can target 1 "Therion" monster or 1 Reptile monster in your GY; Special Summon this card from your hand, and if you do, equip that monster to this card. ● You can discard 1 card, then target 1 "Therion" Monster Card in your Spell & Trap Zone; Special Summon it. A "Therion" monster equipped with this card gains 700 ATK, also it can activate the 2nd effect listed above as if it were "Therion "Empress" Alasia".

EARTH 8

You can only use each of the following effects of "Therion "King" Regulus" once per turn. ● You can target 1 "Therion" monster or 1 Machine monster in your GY; Special Summon this card from your hand, and if you do, equip that monster to this card. ● When your opponent activates a card or effect (Quick Effect): You can send 1 "Therion" Monster Card from your hand or face-up field to the GY; negate that effect. A "Therion" monster equipped with this card gains 700 ATK, also it can activate the 2nd effect listed above as if it were "Therion "King" Regulus".

EARTH 8

If a monster(s) is sent from the hand to the GY, while this card is in your GY (except during the Damage Step): You can Special Summon this card, but place it on the bottom of the Deck when it leaves the field. You can only use this effect of "Vanguard of the Underground Emperor" once per turn.

LIGHT

2 Reptile monsters (Quick Effect): You can discard 1 monster; place A-Counters equal to its original Level on face-up monster(s) on the field, distributed as you wish. If this card is destroyed by battle or card effect and sent to the GY: You can Special Summon non-Link Reptile monsters with different names from your GY, up to the number of monsters your opponent controls with A-Counters. You can only use each effect of "Alien Shocktrooper M-Frame" once per turn.

LIGHT

2+ Reptile monsters Monsters your opponent controls with A-Counters are changed to Defense Position, also neither player can activate their effects. You can only use each of the following effects of "Cosmic Slicer Zer'oll" once per turn. If this card is Link Summoned: You can add 1 card from your Deck to your hand that has an effect that places A-Counter(s). You can remove 2 A-Counters from anywhere on the field; immediately after this effect resolves, Normal Summon 1 Reptile monster.

LIGHT 5

"Alien Ammonite" + 1 or more non-Tuner "Alien" monsters Once per turn, you can select any number of face-up Spell or Trap Cards. Return those cards to their owners' hands, and distribute new A-Counters among monsters on the field equal to the number of cards returned. Once per turn, you can remove 2 A-Counters from anywhere on the field to destroy 1 card your opponent controls.

WIND 4

1 Tuner + 1 or more non-Tuner monsters If this card is sent from the Monster Zone to the Graveyard: You can target 1 face-up monster your opponent controls; equip this card from your Graveyard to that monster. That monster cannot attack, also its effects are negated. If this card leaves the field while equipped to an opponent's monster by this effect: Take control of the monster this card was equipped to.

DARK 8

1 Reptile Tuner + 1+ non-Tuner monsters If this card was Synchro Summoned using only Reptile monsters as material, it cannot be destroyed by battle or card effects. Once per Chain, when your opponent activates a monster effect, except during the Damage Step (Quick Effect): You can target 1 face-up monster your opponent controls; change its ATK to 0. If this Synchro Summoned card you control is sent to your GY by an opponent's card: You can add 1 Reptile monster from your Deck to your hand.

LIGHT 1

When this card is Normal Summoned, you can Special Summon 1 Level 4 or lower "Alien" monster from your Graveyard. Destroy it during the End Phase.

WIND

2 Level 4 monsters Once per turn: You can detach 1 material from this card, then activate 1 of these effects. ● Target 3 monsters in your GY; shuffle all 3 into the Deck, then draw 1 card. ● Target 1 non-Effect Monster in your GY; Special Summon that target.

WATER

3 Level 4 monsters

Spell Continuous

Each time a face-up "Alien" monster(s) is destroyed, place 1 A-Counter on this card. Once per turn, you can remove 2 A-Counters from anywhere on the field to Special Summon 1 "Alien" monster from your Graveyard.

Spell Normal

Target 1 monster in either GY; Special Summon it.

Spell Quick

Tribute 1 Reptile monster; for every 2 Levels that Tributed monster had on the field, Special Summon up to 1 "Ogdoadic Token" (Reptile/DARK/Level 2/ATK 0/DEF 0). During your Main Phase: You can banish this card from your GY, then target 1 of your banished Reptile monsters; shuffle it into the Deck, then you can send 1 Reptile monster from your Deck to the GY. You can only use each effect of "Ogdoadic Daybreak" once per turn.

Spell Continuous

You can send 1 monster from your hand or field to the GY, then target 1 Reptile monster in your GY with a different original Attribute than that monster; Special Summon it. During the Main Phase, if a monster is sent to your opponent's GY: You can send 1 Reptile monster from your Deck to the GY. You can only use each effect of "Ogdoadic Serpent Strike" once per turn.

Spell Normal

Send 1 Reptile monster from your Deck to the GY, then if you have 5 or more Reptile monsters with different names in your GY, you can Special Summon 1 Reptile monster from your GY. You can only activate 1 "Ogdoadic Water Lily" per turn.

Spell Normal

Send 1 monster from your hand to the GY; Special Summon 1 Level 1 monster from your hand or Deck.

Spell Normal

Destroy all monsters your opponent controls.

Spell Normal

Discard 1 card. Select 4 Reptile-Type monsters from your Deck and send them to the Graveyard.

Trap Continuous

Once per turn, when you take Battle Damage from a battle involving a Reptile-Type monster, you can Special Summon 1 Reptile-Type monster from your Deck with ATK less than or equal to the Battle Damage you took.

Trap Continuous

Non-Reptile monsters you control cannot attack, also you cannot activate their effects. You can only use each of the following effects of "Viper's Grudge" once per turn. If a face-up Reptile monster(s) you control is destroyed by battle or sent to the GY: You can Special Summon 1 Level 4 or lower Reptile monster from your Deck. If this card is destroyed in the Spell & Trap Zone: You can return all your banished Reptile monsters to your GY.