Obsidian

Obsidian Magician
Rank 4 DARK Rock/Xyz/Effect
2100/800
2 Level 4 Rock monsters
While this card has material, negate all cards and effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy those cards. During each of your End Phases: Detach 1 material from this card.

Obsidian Elder Pliny
Level 4 DARK Rock/Effect
1800/1100
Negate all monster effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy those cards. If you control a DARK "Obsidian" monster: You can Special Summon this card from your hand. You can only use this effect of "Obsidian Elder Pliny" once per turn.

Obsidian Sample
Level 4 DARK Rock/Effect
800/1100
You can target 1 DARK "Obsidian" Effect Monster you control; negate its effects, and if you do, Special Summon this card from your hand. If this card is detached from a Rock Xyz Monster and sent to the GY: You can target 1 Spell/Trap your opponent controls; destroy it. You can only use each effect of "Obsidian Sample" once per turn.

Obsidian Fossyl
Level 4 DARK Rock/Effect
1100/800
When your opponent activates a card or effect that would destroy a DARK "Obsidian" monster(s) you control (Quick Effect): You can Special Summon this card from your hand, and if you do, negate that effect. If this card is detached from a Rock Xyz Monster and sent to the GY: You can target 1 monster your opponent controls; destroy it. You can only use each effect of "Obsidian Fossyl" once per turn.

Obsidian Fuel
Normal Spell
Add 1 DARK "Obsidian" monster from your Deck to your hand, then destroy 1 card from your hand or field. If you control a DARK "Obsidian" monster: You can banish this card from your GY; draw 1 card, then destroy 1 card from your hand or field. You can only use each effect of "Obsidian Fuel" once per turn.

Obsidian Relic
Level 4 DARK Rock/Effect
1100/2100
When an opponent's monster declares an attack: You can Special Summon this card from your hand, then end the Battle Phase. If this card is detached from a Rock Xyz Monster and sent to the GY: You can target 1 DARK "Obsidian" monster in your GY, except "Obsidian Relic"; add it to your hand. You can only use each effect of "Obsidian Relic" once per turn.

Obsidian Golem
Level 4 DARK Rock/Effect
800/2000
If this card is Normal or Flip Summoned: Change this card to Defense Position. Negate all monster effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy those cards. The first time this card would be destroyed by battle each turn, it is not destroyed.

Obsidian Guardian
Level 4 DARK Rock/Effect
2000/0
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) while you control no monsters. Negate all monster effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy those cards. If this face-up card would leave the field, banish it instead.

Obsidian Joker
Rank 4 DARK Rock/Xyz/Effect
2400/2000
2+ Level 4 Rock monsters
While this card has material, negate all cards and effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy those cards. During each of your End Phases: Detach 1 material from this card, and if you do, if this card has no materials as a result, you can attach 1 face-up monster your opponent controls to this card as material.

Obsidian Neolith
Level 8 DARK Rock/Breakdown/Effect
800/2100
Breakdown Level 6
You can reveal this card and 1 other DARK "Obsidian" monster in your hand; Special Summon 1 of them and discard the other. Negate all monster effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy this card.

Obsidian Eolith
Level 6 DARK Rock/Breakdown/Effect
1300/2600
Breakdown Level 4
Cannot be Normal Summoned/Set. Must first be Breakdown Summoned. Cannot be destroyed by battle. Negate all Spell/Trap Cards and effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy this card.

Obsidian Paleolith
Level 4 DARK Rock/Breakdown/Effect
1800/3100
Cannot be Normal Summoned/Set. Must be Breakdown Summoned. Negate all card effects activated by your opponent that target exactly 1 DARK monster you control (and no other monsters), and if you do, destroy those cards. You can only use each of the following effects of "Obsidian Paleolith" once per turn. You can target 1 Rock Xyz Monster in your GY; Special Summon that target. You can target 1 Rock Xyz Monster you control; attach this card and 1 face-up monster your opponent controls to it as material.

Obsidian Flint
Normal Spell
Add 1 DARK "Obsidian" monster from your Deck to your hand. If this card is in your GY, except the turn it was sent there: You can banish this card and discard 1 DARK "Obsidian" monster; draw 2 cards. You can only use each effect of "Obsidian Flint" once per turn.

Obsidian Nodule
Equip Spell
Special Summon 1 DARK "Obsidian" monster from your hand or GY, and if you do, equip it with this card, then, if the equipped monster is an Xyz Monster, attach the top card of your Deck to it as material. The equipped monster cannot be destroyed by battle. You can only activate 1 "Obsidian Nodule" per turn.

Obsidian Knot
Normal Trap
Tribute 1 DARK "Obsidian" monster, then target 2 cards on the field; destroy them. If this card is in your GY, except the turn it was sent there: You can banish this card; add 1 "Obsidian" Spell/Trap from your Deck to your hand, except "Obsidian Knot". You can only use each effect of "Obsidian Knot" once per turn.

Obsidian Lithos Legacy
Counter Trap
When a Spell/Trap Card, or monster effect, is activated: Tribute 1 DARK "Obsidian" monster from your hand or field; negate the activation, and if you do, destroy that card. You can only activate 1 "Obsidian Lithos Legacy" per turn.