Two less conventional suggestions for this deck: Keiga, the Tide Star and Roalesk, Apex Hybrid seem weird for a clone since you generally would not want to copy legendaries, but both of them have very strong Death Triggers (Roalesk an ETB trigger as well). Since the Legend rule helps you kill off the clones, this can effectively allow you to very cheaply trigger their strong abilities multiple times.

@He_Who_Hungers

Keiga’s not a bad idea! I still have one leftover from my Marchesa, the Black Rose deck where I used Marchesa’s reanimation ability and Graft creatures to loop him over and over again. My playgroups still refuse to run Homeward Path for some reason, so that could be really fun! Especially if I add back in a sack outlet like Ashnod's Altar or something because right now the only way that I can get rid of my own Keiga is by cloning him, and if someone actually brought out a Homeward Path or some other kind of Brand effect, then I’d want a way to get rid of all the things I stole

Roalesk could be cool in the right build of this deck, but this particular build doesn’t really care about attacking and doesn’t have anything worth proliferating outside of the two planeswalkers right now. Kind of the same reason why I wouldn’t run Jugan, the Rising Star