Koa'ki Ring - STBL-EN056 - Common - 1st Edition from Starstrike Blast 1st Edition, available at 401 Games Canada.

• Rarity: Common
• Card Text:
  Reveal 1 Iron Core of Koa'ki Meiru in your hand to select 1 face-up monster on the field. Destroy that monster, and inflict 1000 damage to both players.