Tag @magicjudge under this post just to remeber her, she has a long week ahead answering this over and over
SHAMELESSLY STOLEN FROM REDDIT
To answer the inevitable billion and one rules questions:
1. Go to [Gatherer](http://gatherer.wizards.com/Pages/Default.aspx) and pull up the text of the land you’re wondering about. 2. Look at the text of the ability you’re wondering about. 3. Is that ability one that produces mana without targeting anything? Then it’s a mana ability and is not removed. Is it anything *other* than producing mana without targeting anything (remember: look for the exact literal word “target”)? Then it’s not a mana ability, and gets removed.
Also, if there are two abilities – one mana, one not-mana – and the mana ability depends on something done by the not-mana ability? Probably not gonna work.
Here are some example abilities:
> As Watery Grave enters the battlefield, you may pay 2 life. If you don’t, Watery Grave enters the battlefield tapped.
This isn’t a mana ability. It gets removed. Watery Grave will always enter untapped. You won’t even get a choice to pay life; it just will be untapped. You can’t have it enter tapped even if you want to.
> {T}: Add one mana of any color to your mana pool. Spend this mana only to cast a creature spell of the chosen type, and that spell can’t be countered.
(from Cavern of Souls)
This is a mana ability. But it depends on information from a non-mana ability. If Cavern entered the battlefield after Blood Sun, then no creature type was chosen and the mana this produces will not be usable!
> {T}: Add ©© to your mana pool. Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi.
(from Eldrazi Temple)
Mana ability. Always works under Blood Sun. Same goes for all the Tron lands.
> Selesnya Sanctuary enters the battlefield tapped. > > When Selesnya Sanctuary enters the battlefield, return a land you control to its owner’s hand.
Two abilities, neither of them mana abilities. Both go away under Blood Sun. Selesnya Sanctuary enters untapped, and you do not bounce a land.
> A card that says to do something when it enters the battlefield, or as it enters the battlefield, or if it would enter the battlefield, or that it enters with some kind of counters on it.
Don’t do that thing. Blood Sun turns it off. Yes, really. That was a fairly recent rules change – it happened in the Ixalan rules update.
*Edit Minor text changes
