Just use It with my Ra deck. 20000 ATK & DEF with helping of Gift of mystical Elf and Aegis of Gaia. And it's 1 copy of Cure Mermaid what If I put 3 copies of It? More than 50000 ATK & DEF for Ra. You can use equip spell to increase Cure Mermaid's ATK like Black Pendant or Lucky Iron Axe
she pops up in the trader shop sometimes when it resets. just make sure to check your shop every time it resets. right now shes only available through the trade shop. they may possibly have her in a pack in the future.