Fortress Whale, Legendary Fisherman and Amphibian Beast are must cards for this deck, and the other high level monster are level 5, because the main strategy of this deck is to use The Legendary Ocean effects in order to summon the level 5 monsters
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SR Super Rare Scatter Fusion X SPELL Continuous During your Main Phase, if your opponent controls a monster: You can Fusion Summon 1 non-Rock "Gem-Knight" monster from your Extra Deck, using monsters from your Deck as material, also you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except "Gem-Knight" monsters
4 Fusion Summoning is Home to Some of Yu-Gi-Oh!'s Most Iconic Archetypes Tearlaments and Branded Changed an Integral Mechanic For the longest time, Fusion summoning was inefficient because players had to use two specific monsters to summon one card from the extra deck, meaning that it often took too many resources for the summoning method to thrive
