Hollow Trees enters tapped.
You may choose not to untap Hollow Trees during your untap step.
At the beginning of your upkeep, if Hollow Trees is tapped, put a storage counter on it. , Remove any number of storage counters from Hollow Trees: Add for each storage counter removed this way.
If the land is tapped by some external effect, no counters are removed from it.
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
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
It is only considered “tapped for mana” if you activate its mana ability and generate mana 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 Hollow Trees: Add 
for each storage counter removed this way.
