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.
NM-Mint - $22.00
Lightly Played - $19.80
Moderately Played - $17.60
Heavily Played - $15.40
Damaged - $11.00
NM-Mint Non English - $22.00
Lightly Played Non English - $19.80
Moderately Played Non English - $17.60
Heavily Played Non English - $15.40
Damaged Non English - $11.00