1st. 3 copies of the Oracle of Mul Daya seems unnecessary for two reasons. a. If you have two on the field you will mostly likely not need them both. The ability does stack but the odds of playing both and using their abilities are slim. b. With the ramp implemented in this deck the odds of getting a land on top to trigger the ability or lets say even play an additional land, becomes unlikely. You are playing so much from your deck and hand the odds of actually using it are slim. 2. Remember that your good creatures are mostly high costs (with an exception being Glissa) a. You will be relying on your removal for the first couple of rounds and making a choice to go for land or removal in the beginning of a match. To allow more room to work with, more mana for you to use implement creatures that tap for mana. I. Cards that come to mind: Birds of Paradise, Greenweaver druid, Llanowar elves, etc. II. Those allow for chump blocks in the beginning as well as mana acceleration. They are also pretty cheap (exception being birds). 3rd. To fully use Glissa find an artifact that can be useful in late game and early game. Steel hellkite is good but consider that they will try to remove Glissa making the idea of reviving him not as effective. Overall, Good deck. Remember though the best cards in a deck will give you an advantage but not always the win.
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The deck seems to flow pretty well, but there are a couple of things you may want to keep in mind. 1st Ob, Nixilis is a great play. BUT, it is legendary meaning that although it is something you would like to play every game, it is not something you want two of in your hand. Keep in mind that the green ramp will increase your odds dramatically in getting creatures. 2nd. Khalni heart expedition is a great card IF you can get it to go off. If you play test this deck you might realize that often enough you are left with a dead card on the field, it doesnt seem to go off as quickly or often as it should. You might want to consider running "Growth Spasm" as it would allow you to grab a land and have a chump blocker who can also be used as a mana source. Lastly, 3rd. Oracle of Mul Daya is an amazing card, however having two of them on the field is mostly useless, granted the ability can stack and you could get two lands out... However, you are grabbing so much land and fetch lands make the odds of you getting a land on top slim. Slimmer on turn 3 or 4 in which you play oracle. You might want to choose a better option or at least limit it down to 2 copies and substitute another card you might use more often. Such cards as "vines of the vastwood" would act as a pump and offers a creature shroud for a turn, it might be a better replacement for 1 Ob, 1 oracle and 1 Khalni. The deck is good. There could just be small card adjustment, with the exception of Khalni heart expedition, it just comes to reducing the odds of drawing certain cards. Kudos on the deck.