Phyrexian Furnace exiles graveyard cards and can strip back Cabal Therapy flashback fuel or hate on Withered Wretch's own graveyard-hate ability indirectly by denying resources, while drawing a card when sacrificed for value. Uktabi Orangutan has no artifact targets here (Cursed Scroll is their only artifact, a fine target) and adds a body against their efficient creatures. Sylvan Library is risky against discard-heavy decks like this since Duress and Cabal Therapy can strip your hand, making the life payments for extra cards less appealing when you're already resource-strained. Keep Swords to Plowshares in to answer Hypnotic Specter and Nantuko Shade cleanly.