Rakdos Delirium relies heavily on its graveyard for Nethergoyf sizing, Street Wraith cycling, Detective's Phoenix bestow recursion, and Stitcher's Supplier fueling delirium; Grafdigger's Cage and Tormod's Crypt directly attack that plan by stopping creatures from entering off the graveyard/library and exiling their graveyard outright. Emrakul is too slow and clunky against a deck full of cheap removal like Lightning Bolt and Flare of Malice that can also strip your hand with Thoughtseize, so it comes out, along with Glaring Fleshraker which dies too easily to their removal suite. Dismember and Kozilek's Command remain premium answers to their small creatures like Orcish Bowmasters and Moonshadow.