This ingenious loop turns the humble Crookshank Kobolds into an endless engine of sacrifice and resurrection, fueled by the recursive permission of Leonardo, Sewer Samurai. Because Leonardo allows you to cast creatures with power or toughness 1 or less straight from your graveyard during your turn, you can repeatedly feed the Kobolds to Carrion Feeder and immediately cast them right back out for zero mana. Normally, those creatures would enter with a dreaded finality counter and be exiled upon death, but Solemnity acts as the ultimate anchor here by entirely preventing any counters from being placed on creatures. With Solemnity nullifying the downside and Leonardo providing the continuous graveyard access, Carrion Feeder can grow indefinitely while triggering endless sacrifices and death triggers.