I think the point is not to play praetors? Just use karn to get them? Anyways I quite like it!
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Honestly make you lands non-legendary, your mana base is going to suck seeing as none (or very few) add more than just one colour and you don't have ramp, also add ponders of preordains.
Put in Coat of arms or somthing like that, maul splicer is also REALLY expensive, I don't see you ever playing it in a game. Same with darksteel. Mirror golem isn't enough bang for your buck. I'd put in more precursors and pump spells like giant growth. Otherwise it's a solid deck!
I'm assuming this is legacy/extended sooo.... First off, 4 Naya charms. Tapping ALL of thier creatures for 3? Awsome. Allows for a full direct swing. Add some more dual lands/convertion lands, e.g Fire-Lit Thicket, Rugged Prairie, Wooded Bastion. 2 Balefire leiges, nuff said. Remove the Noble Heirarch, the exalted aint that great seeing as you should be swinging with everything every turn. Your bird should be good. Take out Hushblade and add cultivates/kodama's reaches. Add 4 Lighting Helix. Add 4 Wild Nacatl. 4 Wooly Thoctars. Also take out the battlemages and the twinclawes and the glorysclae viashinos. Add either a couple Sarkhan Vol or Garruks. your choice. Best would be 2 of each. Take out obilisks for Thran Dynamo's or Sol Rings. And you don't REALLY need knotvine mystics. Add some Spellbreaker Behemoths and Mycoid Shepards, maybe Baneslayers or Wurncoils. Lastly you may want Harmonize to gain you some card advantage, I have lot's of experiance playing Naya just so ya know, there my fav colors :)
My only question..... Why death cultists? I'm assuming this is legacy so put in counterspell's (Literally) There only like a buck and everyone with a collection seems to have a set or two. If they kill your horror then your kinda screwed... Also you don't need so much bounce. Add some removal, it serves the same purpose but it also gets rid of pesky low drop creatures.
No counterbalance?
Awsome I love it.
Why no Baneslayers?
I would plash red so cliffrunner has haste and also Raging Ravine And Vengent. Even Titanic Ultimatum.