Mono water. Every site is a one-of because the avatar plays them blind off the top - all water means every flip is good, and you walk toward their side as you build. Everything either pulls people into the water or profits once they're in it. Riptide, the Nixie, and the Succubus drag them a step at a time, Call of the Sea and Stormy Seas dunk whole squares, and whatever can't swim drowns. Lugbog Cat lands on any water site, including the one you just made next to their avatar, and Ruler of Thul lets the team wrap around the map edges. Pied Piper takes every 1-power minion on the board, which breaks token decks in half. Mesmerism just takes their best card. Silver Bullet fetches from the collection, and Elder Ruins turns a spare frog into a Shoggoth. Atlantean Fate floods their best utility sites into blank water.