Historical Rules · 25 August 2017
Rule 711.1a
Official source text from the 25 August 2017 Rules release
A double-faced card’s front face is marked by a front-face symbol in its upper left corner. On Magic Origins double-faced cards, the front-face symbol is a modified Planeswalker icon. On cards in the Innistrad block and Shadows over Innistrad set, as well as on Ulrich of the Krallenhorde in the Eldritch Moon set, the front-face symbol is a sun. On other Eldritch Moon double-faced cards, the front-face symbol is a full moon.