4c HollowOne wants to discard and recur cheap threats quickly (Hollow One, Vengevine, Detective's Phoenix, Marauding Mako), and while it isn't purely colorless, Consign to Memory still answers Hollow One and any colorless-cast spells while replicating against multiple threats in a fast game. Erode gives you a hard answer to a recurring Vengevine or Hollow One that your maindeck removal can't always catch in time. Cut the passive Consult the Star Charts and situational Isochron Scepter since you need to prioritize efficient interaction against their explosive graveyard-fueled curve. Keep Galvanic Discharge and Wrath of the Skies in as your primary answers to their small aggressive creatures.