When youre trying to flip Kuja, playing Wizards like Harmonic Prodigy and Mysidian Elder will get you there much faster
If you can play The Emperor of Palamecia on turn 2, then you get to cast your first 4-drop spell on turn 3 and start the engine right away, which is bound to be awesome
That's a game-ender waiting to happen, especially in decks like G'raha Tia, Scion Reborn, Isshin, Two Heavens As One, Baylen, the Haymaker, or any go-wide Commander shell looking for a top-end swing spell in disguise
If you are like me, I love clicking on my pet continuously
While Rhys is vulnerable at 1/1, and his ability is quite expensive, his low mana cost makes him easy to weave into a turn, forcing your opponents to answer him immediately or else
Ruby/Amethyst and Emerald/Steel are both great color combos, so these may well be easy to upgrade