Historical Rules · 30 July 2024
Rule 802.4
Official source text from the 30 July 2024 Rules release
If more than one player is being attacked, controls a planeswalker that’s being attacked, or protects a battle that’s being attacked, each defending player in APNAP order declares blockers as the declare blockers step begins. (See rule 101.4 and rule 509, “Declare Blockers Step.”) The first defending player declares all their blocks, then the second defending player, and so on.