iMtG Server: Gathering

I am curious as to getting input on making this deck better any pointers would be greatly appreciated.

Zombie 67 cards, 0 sideboard 20 {Swamp} 1 {Terramorphic Expanse} 1 {Buried Ruin} 22 lands 1 {Cadaver Imp} 1 {Abattoir Ghoul} 1 {Liliana's Shade} 1 {Nested Ghoul} 1 {Polluted Dead} 1 {Walking Corpse} 1 {Skinrender} 1 {Highborn Ghoul} 1 {Ghoulraiser} 1 {Gravecrawler} 1 {Veilborn Ghoul} 1 {Gravedigger} 1 {Organ Grinder} 1 {Zombie Goliath} 2 {Bog Raiders} 1 {Unbreathing Horde} 1 {Geralf's Messenger} 1 {Black Cat} 1 {Crypt Ripper} 1 {Sightless Ghoul} 21 creatures 1 {Curse of Oblivion} 1 {Corrupt} 1 {Liliana Vess} 1 {Moan of the Unhallowed} 1 {Consume Spirit} 1 {Evil Presence} 1 {Call to the Grave} 1 {Victim of Night} 1 {Cellar Door} 1 {Disentomb} 1 {Quag Sickness} 1 {Murder} 1 {Ghoulcaller's Chant} 1 {Vile Rebirth} 1 {Mutilate} 1 {Nim Deathmantle} 1 {Hideous Visage} 1 {Rise from the Grave} 1 {Gruesome Deformity} 2 {Reap the Seagraf} 1 {Curse of Thirst} 2 {Gravepurge} 24 other spells Sideboard

Add a  {zombie apocalypse}

Consistency. You have too many "1 of this". You don't want random hands everytime you play. Pick a 5 zombies you like and get a playset of each and try o have them range in mana costs.