4c HollowOne aims to dump its hand fast with Burning Inquiry and Faithless Looting to enable cheap Hollow One and Vengevine, so Consign to Memory can counter colorless spells like Hollow One itself and any triggered abilities, disrupting their reanimation-style plan. An extra Swamp smooths your black-heavy removal suite (Fatal Push, Thoughtseize, Orcish Bowmasters) which is critical since Orcish Bowmasters punishes their card-draw-heavy discard outlets like Burning Inquiry and Faithless Looting. Cut Quantum Riddler since it's too slow against their explosive graveyard-fueled starts, and trim an Island since you're leaning more black for early interaction. Keep Solitude to answer Hollow One, and rely on both Solitude and Fatal Push to handle hasty threats like Vengevine before they attack.