53 life? I have no idea what you mean by this?

I have built a Dimir mill deck and would like some feedback on what you think about it. Test playing it has done really well, I sometimes get mana screwed or flooded and those are the only times I have lost. Do you have any suggestions? The one card I have in my sideboard is a card I am getting but don't have yet. I don't plan on going out and dropping $100 buying cards - these are just cards I have gotten from boosters and FNM drafts...

****Would like to keep it standard****

Creatures:
Shadow Alley Denizen
Shipwreck Singer
Deathcult Rogue
Undercity Informer
Wall of Frost
Balustrade Spy
Insatiable Harpy
Returned Centaur x4
Jace's Mindseeker x2
Shipbreaker Kraken

Instants:
Boon of Erebos
Killing Glare
Dimir Charm
Essence Scatter x2
Phariska's Cure
Voyage's End
Crypt Incursion
Grisly Spectactle

Sorcery:
Tome Scour x2
Paranoid Delusions
Diabolic Tutor
Psychic Intrusion
Thass'a Bounty

Artifact:
Milstone

Enchantment:
Aqueous Form
Sensory Deprivation
Viper's Kiss x2
Baleful Eidolon
Contaminated Ground
Ordeal of Erebos
Quag Sickness x2

Planeswalker:
Ashiok - Nightmare Weaver

Land:
Dimir Guildgate x3
Island x7
Smap x11
Unkown Shores

Sideboad:
Psychic Spiral