Interesting deck, make Death run completely off mark (See Scorpio for reference) and only run Stone Towers.
Heavy Armor and Vanadium Wardens hardly have to do with the theme. Removing them would be good.
Alternatively, you could have BBs and Granite Skins run off mark (or replace Granite Skins with Quicksands since Quicksands would work better off of mark than Granite Skin albeit is less thematic) and have a mainly poison based deck.