The water and the moon have a symbiotic relationship. 

Oceana will guide you into victory by showcasing the pride of the Leo.

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First, let's look into what Oceana can do. It has a base of 15 ATK points and Defense Points of only 3. With 120 Hit Points she can stay in the fight. Where this card shines is on its Skill: Tidal Aura. This gives your water and umbra cards at +10 damage boost for damage. This Skill can be used on Oceana itself.   

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Lunar Cascada can one-shot any card in the format currently. By losing 3 Water Element cards and 3 Umbra Element cards for the Signature Move, it can put all of your opponent's Ejinn cards to Sleep. 

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Trench Barb is the ideal partner for Oceana. Not only does it gain an extra 20 damage bonus, it can Perish targets just by rolling a 1. Combo that with the Death Charm, this card can rack up Card Penalty amd Fusionist Perish counts rapidly. 

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Those are some pro tips for this deck. Try out your own combinations and see what potential you can unlock with Leo Burst!