This clever loop turns the cycle of life, death, and blood into an endless engine by weaving together sacrifice and token multiplication. With Doubling Season on the battlefield, every single death triggers Voldaren Bloodcaster to produce a doubled bounty of Blood tokens instead of just one. You then use Phyrexian Altar to sacrifice Falkenrath Forebear for the black mana needed to fuel its own self-recursion, paying the {B} activation cost by sacrificing the very Blood tokens you just generated. Because Falkenrath Forebear keeps returning from the graveyard for less than it produces, you can repeat this macabre dance indefinitely to feed your triggers.