- You cannot activate this effect if you have no Level 4 or lower WATER monsters in your Deck.
- ↑ 1.0 1.1 1.2 1.3 Konami Gameplay FAQ: Ancient Prophecy -- Card Rulings (version 1.0)
- ↑ 2.0 2.1 Konami FAQ: Effect Monster > Shark Cruiser
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