somrune

yea, you should add dralnu, Lich Lord or Grimgrin, Corpse-born as commander, otherwise this deck won't be usable

i've tested the deck on several occasions and the land usually feels ok, i was thinking of increasing to 18.

the geth is better with the other sideboard cards, eventhough 13 zombie tokens is fun. but geth allows you to put more cards in they're graveyards which means i get more zombie tokens for the creatures.
both geth's effect and his intimidating attack allow for milling here, which is the true strength behind it.

the sideboard and other sideboards i gave in the info give more options for the deck, the one i posted is to change the deck from a zombie/graveyard deck to an agressive Mill deck

that's exactly why i combine him with the swords, jace and other effects, it's the perfect card for a qtrong and fast miling deck that allows for more zombies every turn

if you splash some green, you could add parallel lives which doubles the zombie tokens you're getting.
otherwise its a nice zombie buffing deck

the deck looks nice, but its too easy to kill
a lot of players are sideboarding ratchet bombs simply to kill decks like these.
if you trigger ratchet bomb without counters, it'll kill all transformed werewolves since their converted mana cost (while transformed) is 0.

i'd suggest adding some wolves to protect yourself

he could also add a Mimic vat or 2 with that Call to the grave, if a grave titan dies (happens often as its priority target for most) he can put it under that and create additional tokens each turn.

that way, he'll have 4 zombie tokens for 3 mana each turn + a 6/6 deathtouch/haste creature to deal some massive damage

i agree on taking our the gravespawn sovereign, the cost of tapping 5 zombies is just so painful, i doubt it'll pay of in the long run.

as there's no removal in the deck what so ever, i'd opt to add some skinrenders, powerfull zombies on their own right + a nice removal ability.
i don't see why you'd add Lim-Dul without playing some removal spells, the strategy with him is to steal enemy creatures: the enemy wont attack with so many zombie buffs on the field and he'll be trying to find an answer against your attacks (or die) you'd probably just use lim-dul about once or twice each game

it looks nice but have you ever thought of adding Skinrenders? they're great zombies even when their effect isnt used, when it is used, you'll have some nice removal