Historical Rules · 17 July 2015
Rule 711.1
Official source text from the 17 July 2015 Rules release
A double-faced card has a Magic card face on each side rather than a Magic card face on one side and a Magic card back on the other. Each face may have abilities that allow the permanent to “transform,” or turn over to its other face. Tokens and cards with a Magic card back can’t transform. (See rule 701.25, “Transform.”)