Mana Vault

Mana Vault dosen't untap during your untap step.

At the beginning of your upkeep, you may
pay {4}. If you do, untap Mana Vault.

At the beginning of you draw step, if Mana Vault
is tapped, it deals 1 damage to you.

{t}: Add {c}{c}{c} to your mana pool.