I took another look at my cards yesterday as I was dismantling my deck. In the blue-the color I still believe I correctly evaluated as deepest and strongest-I found two cards I wasn't running: Coralhelm Guide and Halimar Tidecaller.
Sigh. Here are two cards that would've been perfect substitutes for Benthic Infliltrator and would've helped me out just as much, if not more. I had at least four cards with Awaken and in nearly every game I played, at least one of my lands became a creature as a result.
But I was too mired in what I thought should be my starting cards to see what cards ought to be. Just goes to show I have more work to do.