This loop sets up a perpetual motion machine of growth and card advantage by turning a simple activation into a self-sustaining cycle. By paying to activate Benthic Biomancer's adapt ability, you trigger its loot effect, which in turn causes Sheoldred, the Apocalypse to reward you with life; this life gain immediately triggers Spider-Man, Peter Parker to place a new +1/+1 counter back onto Benthic Biomancer. Because the biomancer now has a counter, removing it or bypassing the "no counters" restriction isn't strictly necessary for the loop to re-trigger since the loot effect feeds Sheoldred and Spider-Man to continuously fuel the process.