Historical Rules · 15 July 2011
Rule 706.2a
Official source text from the 15 July 2011 Rules release
A copy acquires the color of the object it's copying because that value is derived from its mana cost. A copy acquires the abilities of the object it's copying because those values are derived from its rules text. A copy doesn't wind up with two values of each ability (that is, it doesn't copy the object's abilities and its rules text, then have that rules text define a new set of abilities).