Alright. I've done my first set of tweaks. I ditched the Maritime Guards for two other seafolk that level up: Halimar Wavewatcher and Skywatcher Adept. Leveling up should be no trouble thanks to proliferate. I also added Disfigure to finish off infected baddies, and Cancel and Spell Pierce for classic Blue annoyance. Spreading Seas lets me draw a card, slow the opponent's mana acceleration (if they aren't Blue), and especially, combo nicely with Halimar Wavewatcher's lvl 5 Islandwalk ability, for a 6/6 unblockable creature. I probably should note: This deck is based on cards I actually have. There are probably better cards out there that aren't included here.
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For now, this deck IS the Deadspread intro deck. I intend to tweak it soon enough. I'm considering swapping in for spells that temporarily take away toughness, to take down those tougher creatures.