This loop is a masterclass in turning self-sacrifice into an engine of endless value, anchored by Shilgengar, Sire of Famine and its ability to trade away your forces for Blood tokens. When you feed Furystoke Giant to Shilgengar, the Giant’s persist ability naturally tries to bring it back with a -1/-1 counter, but Melira, Sylvok Outcast steps in with her static ability to completely prevent those counters from ever landing. Because Furystoke Giant returns pristine, you can sacrifice it over and over to continuously churn out Blood tokens while triggering its own entry ability to grant your board a tap-to-damage capability.