i wouldn't bring any kumena, tyrant of orasca and you could also remove seafloor oracle, maybe leave 1. instead you should add 1 or 2 herald of secret streams which makes all creatures with +1/+1 counters on then unblockable. Then add about 3 of Forerunner of the Heralds to search for herald of secret streams and combine it with Song of Freyalise so that you play secret streams when freyalize has put the +1/+1 counters on your creatures. this is usually the winning blow for me on mtg arena. you should also remove 2 Mist-Cloaked Herald and add river sneak instead. those along with curious obsession is a great combination.
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you might want to put a couple of Finest Hour in there too. you don't need Intangible Virtue because you don't have a single token in the deck. I would recommend you take a look at my friend's exalted deck http://www.mtgvault.com/tomi/decks/bant-extrasalted/.
Sigil of the Empty Throne is a useful card in enchantment decks
This is a very good deck you have there.. But i would switch Dawntreader Elk for Llanowar Elves, and you might want to have something to kill a creature with like Doom Blade for the morbid creatures.
this deck looks really good, but i can't see the reason why Day of Judgment is there
the upper half of the list is good but i would leave out Blue completely as ur only blue spell is "Mana Leak", and its ability isn't really necessary in a discard deck, so u can replace ur "Mana Leak", "Islands" and "Cephalid Coliseum" with 6 "Swamps". that should leave u with 56 cards at the moment. then u could add 2 more "Nezumi Shortfang" and also add 2 more "Quest for the Nihil Stone"
What about Kinsbaile Cavalier, gives doubble strike to knight creatures. otherwise very good deck, i'm impressed how u have combined everything