I like this concept, but its possible that the landbase (as with a lot of fast moving 3 color decks) might end up making it a short lived experiment unless I have a lot of fun with it. Fast moving three+ color landbases are a complete beast to field and often don't allow much for budget constraints. In all reality I probably have too many basics in the list as it is given I am not all that heavy on ramping lands. I might end up cutting a few more of them if this gets out the door but I probably still want 10-12 of them.
I ended up choosing Jenara for this because she has access to which were the core colors I was looking for to run as many of the one cast per turn effects as well as giving me access to countermagic. Jenara is a good mana sink that lets me play sort of a draw / go strategy keeping up mana and sinking it into her if I don't need to react to my opponents in a turn. The emphasis on Archon of Emeria effects also keeps me from running a number of toolbox cards that tutor a card to hand like Stoneforge Mystic / Trinket Mage as the multiple spellcast components of these cards interfere with my goal.
I could still run Deafening Silence and Ethersworn Canonist but I didn't include them to start. My concern is that the allowances of what people can cast multiple of might still be a pain in the ass. I also have 4 copies of this sort of effect and I could possibly see the next move being to run additional tutors rather than additional copies especially when I don't intent to be able to abuse the allocation beyond one cast per turn with these.
Decklist
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