Gaap the Divine Soldier

Level 6 DARK/Fiend Effect Monster
2200 ATK / 2000 DEF

All monsters are changed to Attack Position, also their battle positions cannot be changed. (Flip Effects are not activated.) Once per turn: You can reveal any number of Fiend monsters in your hand; this card gains 300 ATK for each, until the end of this turn.

Rulings – Yugipedia

Printings:

Ancient Prophecy: ANPR-EN096 (Rare) - 2009-09-01
Battle Pack: Epic Dawn: BP01-EN150 (Common) - 2012-05-24
Battle Pack: Epic Dawn: BP01-EN150 (Starfoil Rare) - 2012-05-24
Speed Duel Starter Decks: Twisted Nightmares: SS05-ENA10 (Common) - 2020-05-15

Prices:

Cardmarket: 0.10 €
TCGplayer: $ 0.19