Okay, this is just a suggestion, but i think a few more lands and spells would be good for the deck, not completely sure tho
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Didn't see that rules update, that makes me happy :D
Melira doesn't work that way, "Creatures you control can't have -1/-1 counters placed on them." Persisting creatures come into play with the counters on them.
And it seems like that is a lot of land that enters tapped, generally not a good idea without amulet of vigor
Leyline of the Meek might be a good addition :)
Swap Pacifism for Journey to Nowhere, otherwise it seems good, got alot of high cost creatures, but it seems like it would be able to keep the opposition to a minimum while waiting for those big bads to come out
Why the Arid Mesas and Marsh Flats? You only have plains anyways.
Definitely run with 4 chandras and 4 kiln as thats your major win condition. I dont like the ember hauler as its basically 3 mana for 2 damage, and instead of using prodigal pyromancers i'd use Cinder Pyromancer, you lose the ability to do damage to creatures, but whenever you cast a red spell you can untap him
Thanks for the comment, although i dont think sparkmage or ember hauler have a spot in this deck, sparkmages tap effect only really helps the spitfire and not the Kiln Fiend