Mana Vault does not untap during your untap phase. If it remains tapped during your upkeep, Mana Vault deals 1 damage to you.4: Untap Mana Vault. Use this ability only during your upkeep.T: Add three colorless mana to your mana pool. Play these additions as interrupts.
![Mana Vault [Fourth Edition (Foreign White Border)]](http://www.cosmicgames.com/cdn/shop/products/mtg_placeholder_3cad81c4-77ee-4741-82f1-7ef8c845d408.png?v=1675995647&width=1445)
