The spoilers on mtgnews.com have historically been about 95% reliable. There a couple of totally fake spoilers posted several years ago, but since the makeover the mods have done an excellent job of "keeping it real."
The magicplayer.de site has a fake spoiler which is composed of nothing more than unsubstantiated rumor, culled almost entirely from the MTGNews Rumors Forum.
By the way, an imaginary card identical in efect to Absolute Denial was created for the old CPA card set, "Casualties of War." It was called Winds of Stupidity, and Gizmo hit the nail on the head when he noted that it might be the most appropriate card name ever. In other words, it looks neat, but is essentially useless.