Start by changing your mark to death, turning all of the death pillar/pends into water pillar/pends, and then remove the plagues, replacing them with 2 poison.
Then remove the skull buckler and artic dragon, and replace them with 2 chysaora.
You use much more water than death, so it doesn't make sense that your build generates more death than water.
(Yes, octopi are that expensive.)