I don't think you have enough black creatures in the deck to support using the dragon's herald, if you added some more small black guys than just the jund hackblades then it would be alot better, or just drop the hackblades, heralds, and only worry about 2 colours, it would be a bit more stable a mana base.
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Oh, sorry for the double-post, but thanks for any comments!
Looking for any comments, I have a standard tourney this afternoon, I haven't played in a while, and so made something I know how to play from the past (adapted for the new pool) since I don't really know the meta-game