This clever loop exploits the recursive recycling of spells by feeding a creature back into your own engine. By casting Sacrifice, you send Scholar of the Ages to the graveyard while netting a massive chunk of black mana. You then use that mana to cast Victimize, sacrificing another creature to bring back the Scholar alongside whatever fodder you just spent. Whenever Scholar of the Ages hits the battlefield, its enters-the-battlefield ability triggers to pull both Sacrifice and Victimize right back out of your graveyard and into your hand, setting the stage to do it all over again.