Undead army...graveyard fun (Legacy)

A deck Idea I've been playing around with for awhile and decided to settle on a recursion deck.
Some combos and plays. (with the ideal opening hand)

1. [[Swamp]] to cast [[entomb]], place [[Sheoldred, whispering one]] into the graveyard.

2. [[swamp]] to cast [[exhume]] to bring out [[sheoldred, whispering one]].

3. [[urborg, tomb of yawgmoth]] (if available) to use the three mana to pay for [[buried alive]]. There are some options for which creatures to place from here. [[Griselbrand]], [[Overseer of the Damned]], and [[mikaeus the unhallowed]] are a good combo.

4. Upkeep bringout [[griselbrand]], play [[swamp]] then pay the four needed for [[dread return]] or another animate like [[reanimate]] or another [[exhume]] to bring out [[Mikaeus the unhallowed]]

5. Swing and win?

Other good combos that have been working well.

[[Kokusho the evening star]] and [[Jarad, Golgari lich lord]]

Using [[Jarad, Golgari lich lord]]'s ability to sac [[Kokusho the evening star]] giving you 5 life and taking 10 life from your opponent. If you have [[Mikaeus the unhallowed]] on the board thats just a plus, [[Kokusho the evening star]] comes back as a 6/6 taking 11 life next time.

This deck isn't necessarily meant to kill quickly as much as it is to get the big hitters out fast, and consistently. I wanted to keep a theme of zombies and demons, always saw the demons commanding the undead. [[Sheoldred, whispering one]] and [[Kokusho the evening star]] were too good to pass up though.

Any ideas and suggestions on improvement always welcome.