Cube designed to maximize the graveyard as an active zone you play out of. Aggro, midrange, combo, control are all present in capacities that rely on the graveyard.

Recursive Weenies, Reanimation

Looting, Spells in GY Matter

Reanimation, Self-Mill, Madness

Madness, Looting, Unearthing Creatures

Recursion, Giant GY-Matters Monsters, Exploring Merfolk

Un-Cards, Mystery Booster Cards:

Cube rules:
60% direct graveyard interaction
20% graveyard support (discard, mill)

Notable Omissions:
Top-Tier Graveyard Payoffs (Murktide Regent)
Top-Tier Graveyard Hate (Relic of Progenitus, Endurance)
Top-Tier Lands (shocklands)
Two-Sided reanimation (Living Death, Exhume)
Unconditional Reanimation under 4cmc (Animate Dead, Reanimate)