Infernity Dwarf

Level 2 DARK/Warrior Effect
800 ATK / 500 DEF

While you have no cards in your hand, if a monster you control attacks a Defense Position monster, inflict piercing battle damage to your opponent.

Rulings – Yugipedia

Printings:

Yu-Gi-Oh! 5D's Stardust Accelerator promotional cards: WC09-EN002 (Super Rare) - 2009-05-19
Yu-Gi-Oh! 5D's Stardust Accelerator promotional cards: WC09-EN002 (Ultra Rare) - 2009-05-19
Gold Series 3: GLD3-EN028 (Common) - 2010-06-18
Speed Duel: Scars of Battle: SBSC-EN035 (Common) - 2019-08-01

Prices:

Cardmarket: 0.07 €
TCGplayer: $ 0.16