[quote=@EviiPaladin]
Not to be 'that guy' but Xyz have always required the materials to follow the same restrictions. As such, the materials should probably be 2 Level 4 FIRE Monsters or 2 Level 4 Monsters.
[/quote]

I actually kinda knew this when i was making it. Yet then again I didn't want it to be too splashable or too restricted, because when your playing a multi element deck. 2 level 4 fire monsters can be a bit of a pain. 

So I might as well CHANGE the effect to continue itself while still being able to be summoned by other card combinations. 

Name: Ruby Fire Kyuubi
Level/rank: 4
Attribute: Fire
Monster Type: Beast/Effect/Xyz
Effect:
2 Level 4 Monsters
If this Monster has a Fire Attribute monster as a Xyz material it gains the following effect;
Once per turn you can detach 1 Xyz material from this card to target 1 face-up monster your opponent controls. Inflict damage to your opponent equal to half of that monsters ATK
ATK/DEF: 2000 / 1200