Gagaga Cowboy (Secret Rare) [RA04-EN064-SeR]

2 Level 4 monsters
Once per turn: You can detach 1 Xyz Material from this card; apply this effect, depending on this card's current battle position.
• Attack Position: If this card attacks an opponent's monster this turn, it gains 1000 ATK, also the opponent's monster loses 500 ATK, during the Damage Step only.
• Defense Position: Inflict 800 damage to your opponent.