I haven't actually put it together yet, I mainly just wanted to play cantrips with Prowess. As pretty much all the Jeskai cantips are are auras I went deep on Hero so I can run minimal lands and also get extra value with the Heroic triggers. I think running some kill spells would be a good idea, most likely instead of Chosen as the effect its self does not add damage. I'm keen to see your list and how its been going if you have one.
Permalink
I don't think Grim Guardian does all that much. It's a tiny bit of life drain but then it just sits there like Courser but without making card advantage. You are also kind of mixing strategies a bit Spiteful, Scarhide and Herald are kind of aggro cards while the rest of the cards are controlish. I think you should one way or the other, for an enchantment focus maybe something more like this: http://www.mtgvault.com/k1amp/decks/greenblack-constellation/
Play 4 Eidolon of Blossoms. Hands down best Green constellation card.