The second ever Xyz monster I've created that I had to use a different card maker web site: yugico.com.
EDIT: just went to the yugiohcardmaker.net, you can now create Xyz Monster card.
Name: Twilight Nebula Guardian Knight
Card Rarity: Ultimate Rare
3 Level 6 monsters
This card's Attribute is also treated as DARK. You can also Xyz Symmon this card by using a "Twilight Nebula Knight" you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) You cannot activate this card's effect on the turn you Special SUmmoned this card this way. You can detach 1 Xyz material from this card, destroy 1 monster you opponent controls. This card gains ATK for equal to halve of the destroyed monster's ATK, until the End Phase. You must have 1000 Life Points or less to activate and to resolve this effect.
Serial Number: 03427437
(c) of Card data and Twilight Nebula Guardian Knight is by A5L(Alex Loredo).
(c) of Yu-Gi-Oh Template is by Kazuki Takahashi.