Darktellarknight Batlamyus (Ultra Rare)

2 Level 4 tellarknight monsters
All face-up monsters on the field become DARK. You can detach 1 Xyz Material from this card and discard 1 card; Special Summon from your Extra Deck, 1 LIGHT tellarknight Xyz Monster by using this face-up card you control as the Xyz Material, also you cannot Xyz Summon other monsters for the rest of this turn. (This is treated as an Xyz Summon. Xyz Materials attached to this card also become Xyz Materials on the Summoned monster.) This effect can be activated during either player's turn, if you have 7 or more tellarknight monsters with different names in your Graveyard.