In a Commander game, each player puts their commander from their deck face up into the command zone. See rule 903.6.
July 3, 2020 · Core Set 2021
In a Commander game, each player puts their commander from their deck face up into the command zone after having the opportunity to reveal a card with a companion ability and before shuffling. See rule 903.6.
September 29, 2017 · Ixalan
One card (Power Play) states that its controller is the starting player. This effect supersedes these methods.
June 1, 2014 · Conspiracy
One card, Power Play, states that its controller is the starting player. This effect supersedes these methods.