Venom Support

[SecondWar]

The Nightmare of Venom
Field-Spell Card
Monsters lose 1000 ATK for each Venom Counter on them. Destroy a monster it its ATK becomes 0 by this effect. During each player's End Phase, place 1 Venom Counter on each face-up monster, except "Venom" monsters, or "Vennominon, the King of Poisonous Snakes".
 
Venom Naja    EARTH/reptile/tuner        level 4        ATK:1000/DEF:800
When you Normal or Special Summon a "Venom" monster, you can Special Summon this card from your hand. When you do, place 1 Venom Counter on all monster(s) Special Summoned to your opponent's side of the field.
 
Venom Crunch    EARTH/reptile        level 8        ATK:2000/DEF:1800
There can only be 1 face-up "Venom Crunch" on the field. If you control a face-up "Venom" monster, you can Special Summon this card (from your hand). When this card is Special Summoned by this way, flip all face-down Defense Position monsters on the field into face-up Defense Position (Flip Effects are not activated at this time). When this card is face-up on the field, Monster Cards cannot be Set or flipped face-down. If a Monster Card would be Set, it must be Normal Summoned in face-up Defense Position.
 
Venom Tri-Snake        EARTH/reptile/synchro    level 8        ATK:2200/DEF:2000
1 tuner + 1 or more non-tuner Reptile-type monsters
Once per turn, during either's player turn, you can select 1 Reptile-type monster you control. Destroy it, and place Venom Counters on face-up monster(s) your opponent controls equal to level of destroyed monster. When this card is removed from the field, you can Special Summon 1 Reptile-type monster from your hand.
 
Venom Dual-Snake    EARTH/reptile/Xyz Rank 4        ATK:1900/DEF:1800
2 level 4 Reptile-type monsters
Once per turn, during either's player turn, you can detach 1 Xyz Material from this card and select 1 Defense Position monster your opponent controls. Change it to face-up Attack Position (Flip Effects are not activated at this time), and place 1 Venom counter on it. When this card is removed from the field, you can Special Summon 1 Reptile-type monster from your hand.
 
The Blood of Venom
Continuous Trap Card
Each time a monster is destroyed by the effect of "Venom" Card, gain life points equal to the level of destroyed monster x300.

[StarKnightJacobs]

Most of these cards are really awesome, But wow, Nightmare of Venom is kind of overdoing it a little. Most cards wouldn't be able to survive one turn with that field out with its effect alone. Add that with other effects, and you can't even move. Tri-snake should probably also be lowered to a your turn effect too. Other than that, everything looks pretty good.

[SecondWar]

Most of these cards are really awesome, But wow, Nightmare of Venom is kind of overdoing it a little. Most cards wouldn't be able to survive one turn with that field out with its effect alone. Add that with other effects, and you can't even move. Tri-snake should probably also be lowered to a your turn effect too. Other than that, everything looks pretty good.

Regarding the tri-snake, if you read the effect of the card, it says "During either player's turn": You can use this effect during your opponent's batte phase, destroying 1 Venom monster when he is selected as attack target, and distribute Venom counters on the monster that attacked.
Regarding Nightmare of Venom, I agree I exaggerated a bit with this effect.

[SecondWar]

While discussing, I thought in another card:

 

Venom Warrior                 EARTH/reptile/level 4                        ATK:1300/DEF:900

When this card is Summoned, you can Set 1 Normal Trap Card directly from your deck. Once per turn, you can send 1 Reptile-type monster from your deck to Graveyard, and select 1 Reptile-type monster in your Graveyard, Special Summon it, and destroy it during the End Phase (You can only use this effect once per turn).