Historical Rules · 23 August 2019
Rule 700.2e
Official source text from the 23 August 2019 Rules release
Some spells and abilities specify that a player other than their controller chooses a mode for it. In that case, the other player does so when the spell or ability’s controller normally would do so. If there is more than one other player who could make such a choice, the spell or ability’s controller decides which of those players will make the choice.