Grave Titan removed, too many unsatisfying games where he lands on curve and there's no real comeback. Replace with Makeshift Mannequin for more reanimator support.
Pia and Kiran Nalaar not adding enough to aggro, and playgroup not building red artifact decks. Hazoret the Fervent is a more straight-forward curve-topper.
Green
Wanted another 2-drop and Fauna Shaman is perfect, removed Cultivate as it's a little slow for cube
Polukranos, Unchained doesn't explain Escape, and the mess with counters isn't worth the complexity. I'm not promising Grist, the Hunger Tide is less complex, but it is more interesting
Nobody understood that Sorcerous Spyglass was a planeswalker hate card, and even if they did they probably wouldn't run it. Sundering Titan is a classic cube card for ramp/reanimator decks.