This loop turns your graveyard into a perpetual hive by using Phyrexian Altar as both the executioner and the economic engine, converting your creatures into the precise mana needed to keep the cycle going. You cast or reanimate Hornet Queen so its entry triggers a swarm of four deathtouching token companions, giving you five disposable bodies in total. Sacrificing the Queen and all her Insect tokens to the Altar generates the exact five mana required to feed Kenrith, the Returned King's black activation, pulling the Queen straight back from the graveyard to repeat the whole process.