This is probably my best build with The Watcher. The combination of tantrum, Calm-enducing cards, Mental Fortress, Rushdown, Wheel Kick and Talk to the Hand worked really well. It was a small deck (15 cards) which also included a Flurry of Blows and a Halt that came up a lot, but what made it really powerful was the Calipers relic. Against the final boss I was often starting my turn with well over 100 block.