Also stalling until getting the curse out is very unlikely in a deck with virtually no removal. Also getting to 5 mana in a deck with 20 lands is so incredibly difficult, even looking at it statistically, every third card you draw will be a land. 8 turns man (until you have 5 lands on board, statistically).
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Try to keep your deck at 60 cards for overall consistency. I don't like the White Sun's Zenith here as you rarely get a lot of value from it. With this much lifegain perhaps you could up the land count and toss in a Felidar Sovereign as an additional win condition while removing the auras or something.
Steelshaper's gift, Dispatch and a sword or two would make this deck better.
This deck has a really high curve. You might consider increasing your land count or getting some mana ramp. Also Lumberknot seems pretty bad because you have no removal and your guys are pretty hard to kill.