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.dungeonsandjavas.com/cdn/shop/products/mtg_placeholder_57867efd-1b52-41e1-ac68-88daaac71627.png?v=1682587581&width=1445)
