Advanced format ruling
Hydra Viper
Card effect (current official text)Each time this card declares an attack, you must Tribute 1 Aqua-Type monster. This card can attack 3 times during each Battle Phase.
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.