Historical Rules · 26 September 2015
Rule 711.3a
Official source text from the 26 September 2015 Rules release
A checklist card has a normal Magic card back. The face of a checklist card is divided into sections. Each section lists the name and mana cost of each double-faced card it could represent and includes a fill-in circle. Before a checklist card can be used, exactly one of the fill-in circles must be marked to denote which double-faced card the checklist card represents.