This brilliant loop hinges on turning exile into a revolving door for devastating spells. By casting Rise of the Eldrazi, you take an extra turn, destroy a permanent, draw four cards, and naturally send the sorcery into exile as its own text demands. Lier, Disciple of the Drowned ensures your spells can never be countered while gracefully granting flashback to every instant and sorcery in your graveyard. Once you move to that extra turn, Isochron Scepter—imprinted with a copy of Pull from Eternity—taps for just two mana to cast that Pull from Eternity without paying its mana cost. The resolving Pull from Eternity snatches Rise of the Eldrazi right back out of exile and drops it into your graveyard, perfectly poised to be cast all over again for infinite turns.