I cast Tormod's Crypt and then play a Swamp. I tap the Swamp to play two Dark Rituals, giving me 5 black mana in my pool. I spend one of that casting Demonic Consultation. I name Borborygmos. My deck does not have Borborygmos. I spend two more mana to sinkhole my swamp. Then I cast One With Nothing, sacrifice my Tormod's Crypt, and place my exiled deck back into its card box.
I cast Tormod's Crypt and then play a Swamp. I tap the Swamp to play two Dark Rituals, giving me 5 black mana in my pool. I spend one of that casting Demonic Consultation. I name Borborygmos. My deck does not have Borborygmos. I spend two more mana to sinkhole my swamp. Then I cast One With Nothing, sacrifice my Tormod's Crypt, and place my exiled deck back into its card box.
I end my turn.