This clever loop relies on *Biblioplex Tomekeeper* repeatedly entering the battlefield to manually prepare *Grave Researcher*, allowing you to continuously recast the *Reanimate* half of its spell-book ability from exile. As *Biblioplex Tomekeeper* bounces back and forth from the graveyard, *Phyrexian Altar* conveniently converts it into the black mana needed to pay for *Reanimate*'s copy, while *Angelic Chorus* cushions the life loss from *Reanimate* by generating a steady stream of life every time *Biblioplex Tomekeeper* resolves onto the battlefield.