Number 66: Hell Serpent

[Master Hyperion]

Number 66: Hell Serpent
FIRE
Rank 3
[Sea Serpent/Xyz/Effect]
3 Level 3 monsters
Cannot be Special Summoned except by Xyz Summon and in no other way. When this card is Xyz Summoned: Send 2 monsters your opponent controls to the Graveyard and switch control of this card to your opponent. During each End Phase; the controller of this card takes 1000 points of damage. The controller of this card must detach 1 Xyz Material from this card during each of his/her Standby Phase. If this card has no Xyz Materials: The controller of this card cannot Summon monsters.
ATK/3000 DEF/2000

inb4acidgolem

[Giga Hand]

Acid Gole - ah, ninja'd.

I think it's a bit overpowered, if a little situational. The way it's worded means that if you can't send your opponent's monsters, you can't dump this on them. But if you do it's pretty much game. They'll keep taking damage from its effect, while you can do whatever it is your deck does and probably stall your opponent until they can't summon anything. They'll lose the next turn from the burn damage. Kinda requires a dedicated deck, though. Not entirely sure whether it's balanced.