Bottomless Vault [Fallen Empires]

Set: Fallen Empires Type: Land Rarity: Rare Bottomless Vault enters the battlefield tapped.You may choose not to untap Bottomless Vault during your untap step.At the beginning of your upkeep, if Bottomless Vault is tapped, put a storage counter on it.{T}, Remove any number of storage counters from Bottomless Vault: Add {B} for each storage counter removed this way.