In this section

Historical Rules · 29 April 2022

Rule 713.5

Official source text from the 29 April 2022 Rules release

Permalink

Players who are allowed to look at a meld card may look at its half of the combined back face. Players may access Oracle text for the other member of the meld pair and the combined face at any time (see rule 108.1).

Find this number in the current Rules