[AUTO]:When this unit is placed on (GC), you may choose a locked card, and unlock it. If you do, this unit gets [Shield]+5000 until end of that battle.

I've found it at last...

• Number: PR-0234EN
• Rarity: Promo
• Clan: Link Joker
• Nation: Star Gate
• Race: Cyberoid
• Power: 6000
• Shield: 5000
• Grade / Skill: Grade 1 / Boost
• Trigger: None