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 - $68.70
Lightly Played - $61.80
Moderately Played - $54.90
Heavily Played - $48.10
Damaged - $34.30
NM-Mint Non English - $68.70
Lightly Played Non English - $61.80
Moderately Played Non English - $54.90
Heavily Played Non English - $48.10
Damaged Non English - $34.30