Swallowtail Butterspy

Level 4 DARK/Warrior Effect
1800 ATK / 1200 DEF

When another monster you control inflicts battle damage to your opponent: Target 1 face-up monster your opponent controls; it loses ATK equal to the battle damage inflicted.

Rulings – Yugipedia

Printings:

Galactic Overlord: GAOV-EN013 (Common) - 2012-05-08
War of the Giants Reinforcements: WGRT-EN047 (Common) - 2014-01-17
War of the Giants: Round 2: BPW2-EN047 (Common) - 2014-01-17

Prices:

Cardmarket: 0.09 €
TCGplayer: $ 0.11