Are you trying to stay on a budget? I feel like you are missing some really bomb equipments (the 5 mirrodin swords and jitte to mention a few). The Sunhome land that gives a creature double strike also seems really good in this kind of boros build, maybe also Jor Kadeen.
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How do you plan on playing wrexial with no black sources?
Yeah, Splinter Twin makes infinite myrs swing for game when it hits the board.