Advanced format ruling
Maryokutai
Card effect (current official text)During your opponent's turn, when your opponent activates a Spell Card (Quick Effect): You can Tribute this card; negate the activation, and if you do, destroy it.
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.