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Thanks~

. . how do you make text be a link to something

Okay, I am having so much trouble finding someone who actually knows how the effect of Nylea's Presence functions. I have two issues:

Chiefly, let's say I have a green mana card, which I then enchant with Nylea's Presence. If I now tap this land, is it worth one green mana, or two, because the effect of this enchantment is that "enchanted land is every basic land type in addition to its other types." How much mana do I get when it's tapped? One mana? Two mana? Five mana? Six mana? Does it gain the original, basic land type's effect [one mana], and also add one of "every basic type" of mana on top of that? If I want to summon a creature that costs one island, can I tap this enchanted land for it, to summon it? Can I then, after, also summon a monster that costs one red mana? What about a creature that costs one green mana, and three colourless mana?

My second question is, does the effect of this enchantment, affect all enchanted lands? The text states "enchanted land," so is that any enchanted land on my field, or this, specific land enchanted by this card? And why.