Numeron Crystal ("Number" card support)

[davness]

 

Numeron Crystal (Normal Spell)

Declare a Level between 1 and 12: Special Summon this card as a Normal Monster (Rock/LIGHT/ATK 0/DEF 0). It's Level becomes equal to the Level you declared, also you cannot Special Summon for the rest of this turn, except for Xyz Summoning "Number" Monsters. (This card is not treated as a Spell while on the Monster zone). You can only use this effect of "Numeron Crystal" once per turn. A "Number" Xyz Monster that was Xyz Summoned using this card as Material gains the following effects:
● Cannot be destroyed by battle except with "Number" monsters.
● Gains ATK and DEF equal to it's Rank × 200.
● During the End Phase: If a "Numeron Crystal" that was attached to this card as Xyz Material was detached this turn, add it to your hand from the GY.

 

In practice, this cards gives you a free material for a Number monster and grants it it's anime protection and an ATK/DEF boost. If you eventually detach it for an effect, it bounces back to your hand at the end of the turn.