Number 23: Lancelot, Dark Knight of the Underworld

Level 8 DARK/Zombie Xyz Effect
2000 ATK / 1500 DEF

2 Level 8 monsters
This card can attack your opponent directly while it has Xyz Material. When this card inflicts battle damage to your opponent: You can target 1 face-up monster your opponent controls; destroy it. Once per turn, during either player's turn, when a Spell/Trap Card, or another monster's effect, is activated: Detach 1 Xyz Material from this card; negate the activation.

Rulings – Yugipedia

Printings:

Yu-Gi-Oh! ZEXAL Volume 7 promotional card: YZ07-EN001 (Ultra Rare) - 2015-09-01
Breakers of Shadow: Special Edition: BOSH-ENSE2 (Super Rare) - 2016-02-25

Prices:

Cardmarket: 11.00 €
TCGplayer: $ 5.31