Sign in Blood might be a good way to make them draw then discard. It deals damage and since its on your turn there is a lot less chance for them to play before you make them discard.
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Wow I like this! you can pump out a lot of damage while having plenty of control. Very nice
Hmmm... I can see this both ways especially since Nihil activates before Howling Mine. But giving them the chance to fight back is quite risky, afterall when they have cards in thier hand your creatures are very weak and once they have something on the field you lack a way to remove it.
Hmm, I like the Nirkana and Shade together... very mana intensive but the Nirkana's ability means not blocking any Shade or Revenant means taking a ton of damage. By the way, why the Terramorphic Expanses? Since you're single colored and don't use landfall I don't see them being very useful.
I don't see how good the Oran Rief and Joraga combo is. You do realize it says every greeen creature that enters this turn right? But Omnath and Strength of Tajuru together O_o holy crap thats insane and even more so with a Jorraga on the field!!!
Might want to look at adding [Archive Trap]. Otherwise very nice deck. I especially like that runs on such a low mana curve.
The only problem I see is if Emrakul gets removed from the game you're pretty much screwed :-(