Bottomless Vault enters 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. , Remove any number of storage counters from Bottomless Vault: Add for each storage counter removed this way.
Whether or not it is tapped is checked at the beginning of upkeep. If it is not tapped, the ability does not trigger. It also checks during resolution and you only get a counter if it is still tapped then.
04-10-2004
wotc
Counters are not lost if the land is changed to another land type. They wait around for the land to change back.
04-10-2004
wotc
It is only considered “tapped for mana” if you activate its mana ability and generate mana from it.
04-10-2004
wotc
If the land is tapped by some external effect, no counters are removed from it.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
, Remove any number of storage counters from Bottomless Vault: Add 
for each storage counter removed this way.
