Advanced format ruling
Riryoku Field
Card effect (current official text)When a Spell Card that targets exactly 1 monster on the field (and no other cards) is activated: 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.