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The butterfly effect works because when a pylon is successfully installed, anything within the plane becomes expelled out after a matter of time. They pylon blocks INCOMING walks, not outgoing. So shells that expire within the plane ship their souls out to another plane. But for every death within a plane there has to be a death in every plane, so that a jump is made. Overpopulation of a plane comes from one of two things, dumb luck or a blockage of a walk to a plane. And since the plane has no incoming souls, the shells are just that: brainless, souless shells wandering the plane. Nothing happens, and that's what Planeswalkers try to protect. See, we're protecting the entire fabric of time of the planes, not just one single plane.
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