Historical Rules · 1 February 2013
Rule 711.9b
Official source text from the 1 February 2013 Rules release
The face of each 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. When using a checklist card, exactly one of the fill-in circles must be marked to denote which double-faced card the checklist card represents.