while expensive is very true, captain of the watch you could play for free via pre-eminent captain or realistically, any soldier card. Also Ballyrush Banneret is another good card to look at, Kithkin and soldier creatures cost one colorless less to play. Militia's pride is another card to take a look at (spawns kithkin soldiers) . Either way, your deck looks like it will run just fine.
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Hmmm thinking about it, I can see the reasoning behind tectonic edge cause it'll slow down your opponent, however I don't see it slowing them down enough. Personally toss in some honor of the pure and some raise the alarm but that is just me.