All your graveyards cannot hold me! (Golgari)

Playing with graveyards - either filling and using those cards living there, or outright using others' against them.

Part of my 10 Guild EDH Experiment:
One deck per guild, only legal cards are:
-Ravnica and Return To Ravnica Block, plus Innistrad utility land, checkland, one walker, and any timeshifted/core set cards that bear the guild's mechanic
-Must align based on watermarks (no cross guild spells)
-Must contain both guild leaders and both guild champions so the player may choose whichever they prefer as general
-Must include all land and artifact cycles
-No card (outside of Pillar of Paruns and Command Tower) may be shared across guilds
-Each deck should focus on a particular play style