In magic the gathering, a card says that the power and strenght equals to the black permanents you control?

Question

In magic the gathering, a card says that the power and strenght equals to the black permanents you control, does the land count? (swamp) If not, what are the black permanents? Whats the difference? i thought lands are permanents!

Answer 1

swamps ARE permenents but NOT black permenents

there just lands

the creature nightmare has power and toughness = to the number of swamps you control

Answer 2

a permanent is anything in play, but land has no color... so, if you had the creature with power and toughness equal to black permanents you control and it's the only black permanent you have in play, then it would be a 1/1 creature.

Answer 3

Lands are colourless. The colour of a card is determined by it's casting cost, so a land is colourless.

Answer 4

black permanents are the swamps that you control

Answer 5

Lands are indeed permanents, but (this is important) lands NEVER have a color unless some effect specifically states them to.  Swamps (and all other lands) are colorless and are not counted when an effect counts permanents of a color.  

How do you tell what color a permanent is?  It's determined by the casting cost (and possibly by effects that change color), any permanent with a black mana in the casting cost is a black permanent (unless some effect specifically says it isn't), even if you didn't use black mana to cast it (possible for cards with split or guild mana costs).  It is quite possible for a permanent to have multiple colors at the same time.

There are older magic cards that draw effects from the number of lands of a certain type in play, but they have nothing to do with this question.