Tengu 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.
Rulings
- Tributing 1 Aqua monster is a cost for declaring the attack. If you Tribute "Poison Draw Frog" for the attack, you can activate its effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.