Mana Vault doesn'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 your draw step, if Mana Vault is tapped, it deals 1 damage to you. {T}: Add {C}{C}{C}.
NM-Mint - $61.30
Lightly Played - $58.30
Moderately Played - $55.20
Heavily Played - $49.10
Damaged - $39.90
NM-Mint Non English - $61.30
Lightly Played Non English - $58.30
Moderately Played Non English - $55.20
Heavily Played Non English - $49.10
Damaged Non English - $39.90