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Describe the Bug:
Phyrexian Rebirth makes a colorless nonartifact Horror creature token.

Which card did behave improperly ?
Definitely Phyrexian Rebirth. Please don't blame the poor Horror token; it's already painful to keep track of tokens' default types and colors and stats and abilities without them changing on me.

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
FRF.

What exactly should be the correct behavior/interaction ?
The token it makes should be a colorless artifact.

Are any other cards possibly affected by this bug ?
Nope, all the other Horror-making cards make colored nonartifacts like they should.

Turns out we already have a way to fix this. (Which makes me wonder why the Wurmcoil Engine tokens are still Wurmcoil Engines instead of Wurms.) Fixed c1ed37c.

Edit: There's a bug for Wurmcoil Engine.