With the new support in the form of the birb on the horizon the deck will definitely look different by then but in my eyes not by much, the deck will still do what it does best, set up little bit of presence in turn one, then in the course of the opponents turn, you will be morphing and creating the disruptions around what your opponent does and well what attribute you can get out of them
Koraidon is one of the two box legendaries of Scarlet and Violet and a central figure of that generation, so its cards drew strong attention from the launch of the era
If you have no other synergy in your deck, you can untap some lands to make this a 2 mana spell instead of a 4 mana one
Najeela with Gaea's Cradle
Basing on my personal experience, magnetic closures and double wall boxes are also very good upgrades you want to have
For both modes, the value of X is determined as the ability resolves