Number C5: Chaos Chimera Dragon

Level 6 DARK/Dragon Xyz Effect
0 ATK / 0 DEF

3 or more Level 6 monsters
This card gains 1000 ATK for each Xyz Material attached to it. If this card attacks, at the end of the Damage Step: You can detach 1 Xyz Material from this card; this card can attack an opponent's monster again in a row. At the end of the Battle Phase: You can pay half your Life Points, then target 2 cards in any Graveyard(s); place 1 of them on the top of the Deck, and if you do, attach the other to this card as an Xyz Material.

Rulings – Yugipedia

Printings:

Dragons of Legend: DRLG-EN043 (Super Rare) - 2014-04-25
Dragons of Legend: The Complete Series: DLCS-EN045 (Common) - 2020-09-10

Prices:

Cardmarket: 0.18 €
TCGplayer: $ 0.20