This recursive engine turns the continuous sacrifice of Falkenrath Forebear into an endless cycle of death and rebirth, fueled by the mana-generating engine of Phyrexian Altar. Whenever Falkenrath Forebear meets its end at the altar, Voldaren Bloodcaster spots the nontoken creature dying and triggers to produce a Blood token, which is immediately doubled into a pair of tokens thanks to the replacement effect of Parallel Lives. This abundance of artifacts provides the exact fuel needed to activate Falkenrath Forebear's self-reanimation ability, spending the black mana generated by the altar along with the two freshly sacrificed Blood tokens to return the vampire straight to the battlefield. Voldaren Bloodcaster even hovers close to its own transformation threshold with all these tokens piling up, though the core loop already achieves an infinite parade of sacrifices and creature events.