Advanced format ruling
Cold Wave
Card effect (current official text)This card can only be activated at the start of Main Phase 1. Until your next turn, you and your opponent cannot play or Set any Spell or Trap Cards.
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.