What this means is that, should the Troll take lethal damage from something (say from combat, or your opponent casting Pyroclasm), the Troll will stay alive as long as you pump two mana into him
Last time we saw that plane it was all about creature types, and we know that well be returning there in Lorwyn Eclipsed early next year
The best way to take advantage of it is to hold up enough mana to cast this spell, then wait for what your opponent does
However, you can opt out of the receiving end of the site and just use it as a means to send cards to others, then cash out whenever you want to
2015-08-25 Even though these lands have basic land types, they are not basic lands because "basic" doesn't appear on their type line
Every Commander deck runs it