You can reveal 1 «Number» Xyz Monster in your Extra Deck; Special Summon this card from your hand. If you do, this card’s Level becomes the revealed monster’s Rank, also while it is face-up in the Monster Zone, you cannot Special Summon monsters from the Extra Deck, except «Number» Xyz Monsters. You can only use this effect of «Astral Kuriboh» once per turn. A «Number» Xyz Monster that was Summoned using this card on the field as material gains this effect.
• Cannot be destroyed by battle or your opponent’s card effects.