Historical Rules · 30 September 2016
Rule 905.1c
Official source text from the 30 September 2016 Rules release
During the draft, a player can look only at cards in the booster pack he or she is currently drafting from, cards he or she has already drafted, cards that are currently revealed as described in rule 905.2b, and cards that have been drafted face up as described in rule 905.2c. A player may not reveal drafted cards to other players unless an ability instructs him or her to.