Is black (or white) magic real?

[Darkstar]

I've always asked myself why nobody ever talked about gray magic.

Drain? (Heals user and damages foe). Or do you mean like Gandalf the grey?

On a more serious note:

It's not the magic that is real. It's the Denomic forces that one invites in that is.

First of all, it's pretty real (according to the passage); it wasn't some trick of the light. Unless you mean that they accomplished their deed through demonic forces, although it doesn't say that aywhere.

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Exodus 7:8-13
8 The Lord said to Moses and Aaron, 9 “When Pharaoh says to you, ‘Perform a miracle,’ then say to Aaron, ‘Take your staff and throw it down before Pharaoh,’ and it will become a snake.”

10 So Moses and Aaron went to Pharaoh and did just as the Lord commanded. Aaron threw his staff down in front of Pharaoh and his officials, and it became a snake. 11 Pharaoh then summoned wise men and sorcerers, and the Egyptian magicians also did the same things by their secret arts: 12 Each one threw down his staff and it became a snake. But Aaron’s staff swallowed up their staffs. 13 Yet Pharaoh’s heart became hard and he would not listen to them, just as the Lord had said.

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Doesn't say anything about the devil. I think it refers to their magic as 'secret arts'.