Tombstalker really isn't about speed... I believe board presence is not as important as effective board presence. The Flying 5/5 for 1 extra mana is very very strong. You can leave Phyrexian Obliterator up and just swing over for 5. Gurmag Angler is good but for example in the situation where you are keeping a Tron Wurmcoil Engine from swinging at you with Phyrexian Obliterator the Tombstalker will just get in there for 5 where the Gurmag Angler will die.
I see the direction you are going with this deck. You want a anti-meta grind that doesn't play nice with the top decks. To kind of help you along the way until you resolve your Blood Moon. Try running 3 Fulminator Mages and maybe some Ashenmoor Lieges
1
Shadows of Innistrad update...
4x Phyrexian Obliterator
2x Spellskite
4x Tarmogoyf
1x Tasigur, the Golden Fang
2x Thing in the Ice
Lands
4x Bloodstained Mire
2x Overgrown Tomb
4x Polluted Delta
2x Creeping Tar Pit
2x Darkslick Shores
3x Watery Grave
5x Swamp
3x Liliana of the Veil
Instants
2x Disfigure
4x Remand
1x Shadow of Doubt
2x Stubborn Denial
2x Victim of Night
Artifact
1x Engineered Explosives
Sorcery
4x Serum Visions
3x Inquisition of Kozilek
1x Languish
2x Thoughtseize
1x Batterskull
2x Countersquall
3x Disfigure
1x Dispel
1x Engineered Explosives
2x Flashfreeze
1x Illness in the Ranks
1x Languish
1x Shadow of Doubt
1x Spell Snare
1x Surgical Extraction
The new card Thing in the Ice combos well with Spellskite and Phyrexian Obliterator when he flips into Awoken Horror since both of them are Horror creatures as well.
Original List
4x Bloodstained Mire
3x Creeping Tar Pit
5x Swamp
3x Polluted Delta
3x Darkslick Shores
2x Drowned Catacomb
3x Watery Grave
Sorcery: 12
2x Damnation
4x Serum Visions
2x Thoughtseize
4x Inquisition of Kozilek
2x Disfigure
4x Remand
3x Victim of Night
1x Stubborn Denial
1x Spell Snare
Planeswalker: 3
3x Liliana of the Veil
Creature: 11
3x Geralf's Messenger
1x Gray Merchant of Asphodel
1x Tombstalker
4x Phyrexian Obliterator
2x Tasigur, the Golden Fang
2x Shadow of Doubt
1x Illness in the Ranks
1x Hero's Downfall
1x Drown in Sorrow
2x Engineered Explosives
2x Countersquall
3x Fulminator Mage
2x Disfigure
1x Surgical Extraction
1
1