Advanced format ruling
Calming Magic
Card effect (current official text)This card can only be activated at the start of Main Phase 1. During the Main Phases and Battle Phase of this turn, neither player can Summon monsters.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.