Mana Vault Momento

Mana Vault Momento doesn't untap during
your untap step.
At the beginning of your upkeep, you may
pay {4}. If you do, untap Mana Vault
Momento.
At the beginning of your draw step, if Mana Vault Momento is tapped, it deals 1 damage
to you.
{t}: Add {c}{c}{c}.