Number 107: Galaxy-Eyes Tachyon Dragon

Level 8 LIGHT/Dragon Xyz Effect
3000 ATK / 2500 DEF

2 Level 8 monsters
Once per Battle Phase, at the start of your Battle Phase: You can detach 1 material from this card; all other face-up monsters currently on the field have their effects negated, also their ATK/DEF become their original ATK/DEF, and if you do any of these, during the Battle Phase this turn, each time an opponent's card effect resolves, this card gains 1000 ATK until the end of the Battle Phase, also, it can make a second attack during each Battle Phase this turn.

Rulings – Yugipedia

Printings:

Lord of the Tachyon Galaxy: LTGY-EN044 (Ghost Rare) - 2013-05-17
Lord of the Tachyon Galaxy: LTGY-EN044 (Ultimate Rare) - 2013-05-17
Lord of the Tachyon Galaxy: LTGY-EN044 (Ultra Rare) - 2013-05-17
2014 Mega-Tin Mega Pack: MP14-EN024 (Ultra Rare) - 2014-08-28
Battles of Legend: Light's Revenge: BLLR-EN067 (Ultra Rare) - 2017-07-06
OTS Tournament Pack 9: OP09-EN019 (Common) - 2018-12-06
OTS Tournament Pack 9 (POR): OP09-PT019 (Common) - 2018-12-06
Maximum Gold: MAGO-EN062 (Rare) - 2020-11-12
Battles of Legend: Chapter 1: BLC1-EN072 (Common) - 2024-02-22
Maze of the Master: MZTM-EN091 (Quarter Century Secret Rare) - 2025-03-13
Maze of the Master: MZTM-EN091 (Rare) - 2025-03-13
Quarter Century Stampede: RA04-EN067 (Quarter Century Secret Rare) - 2025-04-10

Prices:

Cardmarket: 0.13 €
TCGplayer: $ 0.11