Mana Vault (3ED) from Revised Edition, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Mark Tedin
• Card Text:
  T: Add 3 colorless mana to your mana pool. Mana Vault doesn’t untap normally during untap phase; to untap it, you must pay 4 mana during your upkeep. If Mana Vault remains tapped during upkeep it does 1 damage to you. Drawing mana from this artifact is played as an interrupt.