Historical Rules · 10 August 2018
Rule 711.1
Official source text from the 10 August 2018 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 card to “transform,” or turn over to its other face. Tokens and cards with a Magic card back can’t transform. (See rule 701.27, “Transform.”)