If your main "problem" creatures are creatures with flying, then you should invest in the enchantment known as Gravity Well then.
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Another fun card that you may like to combo with your Warcaller - Magistrate combo is Wirewood Lodge. I mean, who wouldn't want to tap magistrate for an extra forest. Another card you may like is Wellwisher just because it doesn't hurt to boost your life.
A couple of cards that you might find fun are: Immaculate Magistrate, Wirewood Channeler, Wirewood Lodge, Overwhelming Stampede, Lys Alana Huntmaster, Nullmage Shepherd, Priest of Titania, Elvish Vanguard, Jagged-Scar Archers, Wellwisher, Timberwatch Elf, Nissa Revane, and maybe a Hurricane or Squall Line. I couldn't tell you what you really should put in, but those are just a bunch of cards that I would have in an elf deck if I happened to have an elf deck like this. Hope I gave you a fun list to sort through.
I'm thinking about a discard deck for FNM now and I'd like some suggestions on what improvements could be done to, again I think the deck might just be too slow. http://www.mtgvault.com/ViewDeck.aspx?DeckID=108506
Some cards that you may want to consider, "platinum emperion" or "eternity vessel" this is to stay at a high amount of life once you've gained it, "survival cache" this is to draw cards because you'll know that you have more health... supposedly, and "Ajani Goldmane" this is so that you have a monstrously powerful creature and it's useful for gaining health and buffing your creatures. I hope this info helps you out dude.
Though it may be a little late, I would like an opinion about this new deck I'm thinking about making. The only problem I see with the deck is that it's too slow for FNM, but I'm thinking that it'll probably be better than my defender deck. New deck: http://www.mtgvault.com/ViewDeck.aspx?DeckID=161739 Defender deck: http://www.mtgvault.com/ViewDeck.aspx?DeckID=132521
This is definitely an interesting deck, a couple of creatures you might want to put into this deck would be the "modular" creatures (my preferences would be arcbound crusher, arcbound reclaimer, and arcbound ravager), or you may want to consider avalanche riders, bogardan hellkite, and if you splashed green you could put an acidic slime or terastodon. Just throwing those out there as options.
LoL didn't notice you already had traumatize in there.
I would suggest you try to put "milling" cards into a lhurgoyf deck in general because the goyf's get more power from more cards in the graveyards in general. I suggest stuff like "tome scour" or "traumatize" and cards like "mind rot" or any low costing discard card. Hope this info helped a little. O(-..-)O lol, monkey.