This clever loop transforms your graveyard into a revolving door by leveraging Mortuary to intercept creatures as they hit the dirt and placing them right back onto the top of your library. To fund this recycling effort, Krark-Clan Ironworks happily accepts your sacrificial offerings, turning those creatures into a steady stream of colorless mana. Meanwhile, Ranger Class provides the crucial top-deck infrastructure through its third level, letting you seamlessly recast those exact same creatures straight from the top of your library to repeat the process indefinitely.