Slate Warrior

Level 4 WIND/Fiend Flip Effect
1900 ATK / 400 DEF

FLIP: This card gains 500 ATK and DEF.
If this card is destroyed by battle: The monster that destroyed it loses 500 ATK and DEF.

Rulings – Yugipedia

Printings:

Yu-Gi-Oh! The Falsebound Kingdom promotional cards: TFK-EN003 (Super Rare) - 2003-11-04
Yu-Gi-Oh! World Championship Tournament 2004 promotional cards: WC4-003 (Prismatic Secret Rare) - 2004-02-10
Tournament Pack 8: TP8-EN003 (Super Rare) - 2006-04-28
Structure Deck: Lord of the Storm: SD8-EN005 (Common) - 2006-07-12
Duel Terminal 5a: DT05-EN011 (Duel Terminal Normal Parallel Rare) - 2011-05-29
Battle Pack: Epic Dawn: BP01-EN121 (Common) - 2012-05-24
Battle Pack: Epic Dawn: BP01-EN121 (Starfoil Rare) - 2012-05-24
Battle Pack 2: War of the Giants: BP02-EN027 (Mosaic Rare) - 2013-06-28
Battle Pack 2: War of the Giants: BP02-EN027 (Rare) - 2013-06-28
Battle Pack 3: Monster League: BP03-EN013 (Rare) - 2014-07-31
Battle Pack 3: Monster League: BP03-EN013 (Shatterfoil Rare) - 2014-07-31

Prices:

Cardmarket: 0.15 €
TCGplayer: $ 0.22