Number 8: Heraldic King Genom-Heritage

Level 4 LIGHT/Psychic Xyz Effect
2400 ATK / 1800 DEF

2 Level 4 "Heraldic Beast" monsters
Once per turn: You can target 1 face-up Xyz Monster your opponent controls; this card's name and original ATK become that monster's name and current ATK, and this card's effect becomes that monster's original effect, then that monster's ATK becomes 0 and its effects are negated. These changes last until the End Phase.

Rulings – Yugipedia

Printings:

Abyss Rising: ABYR-EN045 (Super Rare) - 2012-11-09
Battles of Legend: Monster Mayhem: BLMM-EN152 (Ultra Rare) - 2025-08-28

Prices:

Cardmarket: 0.16 €
TCGplayer: $ 0.11