Magicians of Bonds and Unity

Level 8 LIGHT/Spellcaster Effect Monster
2500 ATK / 2500 DEF

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by having 25 or more cards in your GY. While your opponent has 25 or more cards in their GY, this card gains 2500 ATK/DEF.

Rulings – Yugipedia

Printings:

Duelist Nexus: DUNE-EN000 (Quarter Century Secret Rare) - 2023-07-27
Age of Overlord: AGOV-EN000 (Quarter Century Secret Rare) - 2023-10-19
Phantom Nightmare: PHNI-EN000 (Quarter Century Secret Rare) - 2024-02-08
Legacy of Destruction: LEDE-EN000 (Quarter Century Secret Rare)

Prices:

Cardmarket: 31.97 €
TCGplayer: $ 49.16