yugioh poseidra deck Structure Realm of the Sea Emperor Single Card Ultra Rare Poseidra, the Atlantean Dragon SDRE-EN001 Deck] Territory of Poseidra :

I figured he would be alright, but I found that he did better than that in the aggressive decks he fit into, providing a surprisingly decent threat at 5 mana to alpha strike out of nowhere

It revolves around Gardevoir's Psy Shadow ability, which lets you attach a single energy to your Active Pokmon on top of the single energy you can attach in a turn

CUT: Chasm Skulker, Dark Hatchling, Dauthi Horror, Dross Harvester, Dusk Mangler, Nihilith, Wharf Infiltrator, Leyline of Anticipation, Heralds Horn, Reflections of Littjara Most of my suggestions for cuts are the weaker, less synergistic Horrors from the base list

If good water type support comes out, then I can definitely see this card becoming very strong

There are several mechanics introduced to Magic: The Gathering through the Commander format that can make your game even more wacky and chaotic than usual

Toon Mermaid