Parasites

[~Duo~]

Pitch-Black Parasite

[Fiend/Tuner/DARK/1]

Once per turn, you can choose to activate one of the following effects:

- Select a monster on the field, then increase the level of this card by the level of the selected monster.

- Take control of a monster on your opponent's side of the field until the End Phase. You cannot declare an attack or tribute the monster. If you activate this effect, you may not Special Summon a monster this turn.

ATK/100 DEF/1000

 

Bacteria Multiplying

Quick-Play Spell

Activate only when your opponent declares an attack towards a "Parasite" monster you control. Negate the attack, end the Battle Phase, and Special Summon a "Pitch-Black Parasite" from your Graveyard (if you can).

 

Soul Leeching Parasite

[Fiend/Union/DARK/3]

During your Main Phase, you can equip this card to a Fiend-type monster you control or unequip this monster from a card you control and Special Summon it in face-up attack position. If the monster equipped with this card destroys a monster in battle, add half the destroyed monster's original ATK or DEF to this card. If the monster equipped with this card is destroyed, Special Summon this card on your side of the field.

ATK/1500 DEF/1500

 

Transfused Parasite

[Fiend/Synchro/DARK/7]

Pitch-Black Parasite + 1 or more non-tuner Fiend-type monsters

This card can only be destroyed in battle. The ATK/DEF of this card is equal to the total levels of all face-up monsters on the field x 250. If this card is destroyed, Special Summon a "Pitch-Black Parasite" from your graveyard.

ATK/ ? DEF/ ?

 

Devouring Darkness

Continuous Trap

When a monster you control that includes "Parasite" in its name is destroyed by an opponent's card effect, activate one of the following effects:

- Destroy 1 card on the field.

- Special Summon a level 3 or lower Fiend-type monster from your graveyard.

 

Tough Skinned Parasite

[Fiend/Gemini/DARK/4]

This card is treated as a Normal Monster while face-up on the field or in the graveyard. When this card is face up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:

This card is the only attack target your opponent can select.

ATK/300 DEF/2200

 

Barbed Parasite

[Fiend/Gemini/DARK/4]

This card is treated as a Normal Monster while face-up on the field or in the graveyard. When this card is face up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:

If this card is selected as an attack target by your opponent, increase the ATK of this card by 500 until the end of the Battle Phase.

ATK/2000 DEF/1600

 

Subtle Poison

Equip Spell

This card cannot be activated unless you control a face-up monster that includes "Parasite" in its name. Equip only to an opponent's monster. Decrease the equipped monster's ATK and DEF by the level of a "Parasite" monster you control x 100. The controller of the equipped monster takes no battle damage from battles involving the equipped monster.

 

I'll add more later.