I am a bit confused about this slumber. The Mad Swamp Walker moves around the map, but his movements don't matter at all. Nothing happens in any range of the miniature, so I feel like I'm missing something? Also am I correct that the basic effect will always cause you to seal 1 card and this cannot be avoided (without completely blocking the basic effect step)?
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Still, a thoroughly vicious Slumber. With this, Rabid Tall Man, and Puppets & Mannequins, I'd sealed over 2/3 of my deck in 3 slumbers. Forget progress, time for Awakening.