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PProteus Machine
Proteus Machine
Artifact Creature — ShapeshifterSCGuncommon
Morph 
(You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When this creature is turned face up, it becomes the creature type of your choice. (This effect lasts indefinitely.)
2/2
Rulings3
2015-02-25Turning a face-down creature with megamorph face up and putting a +1/+1 counter on it is a special action. It doesn’t use the stack and can’t be responded to.
2015-02-25Megamorph is a variant of the morph ability. You can find more information on morph on cards with morph from the Khans of Tarkir set.
2015-02-25If a face-down creature with megamorph is turned face up some other way (for example, if you manifest a card with megamorph and then pay its mana cost to turn it face up), you won’t put a +1/+1 counter on it.