Elemental HERO Escuridao

Level 8 DARK/Warrior Fusion Effect
2500 ATK / 2000 DEF

1 "Elemental HERO" monster + 1 DARK monster
Must be Fusion Summoned and cannot be Special Summoned by other ways. This card gains 100 ATK for each "Elemental HERO" monster in your Graveyard.

Rulings – Yugipedia

Printings:

Yu-Gi-Oh! GX Volume 9 promotional card: YG09-EN001 (Ultra Rare) - 2011-08-07
Star Pack 2013: SP13-EN046 (Common) - 2013-03-01
Star Pack 2013: SP13-EN046 (Starfoil Rare) - 2013-03-01
Battles of Legend: Armageddon: BLAR-EN056 (Secret Rare) - 2020-07-23
Battles of Legend: Chapter 1: BLC1-EN141 (Common) - 2024-02-22

Prices:

Cardmarket: 0.17 €
TCGplayer: $ 0.25