- Tributing 1 Aqua monster is a cost for declaring the attack.
- ↑ 1.0 1.1 Konami Gameplay FAQ: Crimson Crisis -- Card Rulings (version 2.0)
- ↑ 2.0 2.1 2.2 2.3 Konami OCG Card Database: Hydra Viper
- ↑ Konami OCG Card Database: When declaring an attack with "Hydra Viper", if a face-up "Poison Draw Frog" is Tributed, does the drawing effect activate?
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