sun's champion is very proactive and has a ton of synergy with your deck. at the moment you want to be making more tokens and it looks like your deck isnt going to be making enough. maybe take out one of your white sun's zenith? and maybe one less right of flourishing? from person experience drawing it later feels bad. it feels better to draw something like secure the wastes .
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Might I suggest some Sunpetal Groves? Some of those double-white spells might be tricky to play without some white fixing. Also maybe Azorius Charms instead of the Simic ones -- or maybe instead of the Ajanis.
still a W I P so any and all comments are appreciated