Historical Rules · 1 June 2020
Rule 713.3
Official source text from the 1 June 2020 Rules release
If a checklist card is used in a deck, the card it represents is set aside prior to the beginning of the game (see rule 103.1a) and must remain available throughout the game. A checklist card can’t be included in a deck unless it is representing a double-faced card or a meld card.