If youre playing a self-mill deck, its important to incorporate some graveyard protection to ward off interactive spells that shut you down
Chandra, Torch of Defiance One of my favorite planeswalkers of all time, Chandra, Torch of Defiance provides red ramp and an impulse draw, which is all you could want for this strategy
After that, get the Creatures rolling into and out of the Graveyard, and youll soon see how powerful his ability can be despite being a budget Commander
I also predicted Yuna would help with summoning creatures, which she does on both her cards, and that Aerith's sacrifice could be respresented with a death trigger of some sort
But hey, the game's quite free to play these days for the earlier story aspects, so give it a try and learn more about it for yourself