Historical Rules · 25 July 2025
Rule 502.2
Official source text from the 25 July 2025 Rules release
Second, if it’s day and the previous turn’s active player didn’t cast any spells during that turn, it becomes night. If it’s night and the previous turn’s active player cast two or more spells during that turn, it becomes day. If it’s neither day nor night, this check doesn’t happen and it remains neither. This turn-based action doesn’t use the stack. See rule 730, “Day and Night.”