Advanced format ruling
Big Wave Small Wave
Card effect (current official text)Destroy all face-up WATER monsters you control, then you can Special Summon WATER monsters from your hand, up to the number of monsters destroyed by this effect.
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.