Potential target for level 5 water monster: Orca Mega Fortress of Darkness, those missile fish might be viable now, the legendary fisherman, combine with mystic box while legendary ocean active=free enemy destroy, catapult turtle, possible sacrifice toss to deal damage
May I ask what's the point of using 3SD & Legendary Ocean in the same deck? Better yet, 3SD for ANY Water Deck? They have plenty support of their own that can slam faster and harder than 3SD wishes it could. -_-