Ignoring Boost Walker (cuz $$$), what are your thoughts on Beam Sentry? Given this was Magic Atlanteans, you've got serious potential for a Burn/Rush deck, so swapping in Blizzard Bolt and Epiphany could help ramp up the "clock" on your opponent.

With all the Protect/Ward you've got spreading around, this could play like an Aggro War deck with better face damage spells.

!PGM