Mono-White Initiative is full of two- and three-mana disruptive creatures (Thalia, Anointed Peacekeeper, Archon of Emeria) and Chalice of the Void; since Trinisphere is already in our mainboard at 4 copies, there's no more copies to add, so instead we lean on cheap interaction. Dismember gives us cheap, instant-speed removal for their disruptive creatures, while Ensnaring Bridge prevents their threats from attacking as we empty our hand. Liquimetal Coating can turn a problematic Karakas or land into an artifact to neutralize its abilities alongside Karn, the Great Creator. Their deck is proactive and low to the ground, so keep every piece of our fast mana engine (Ancient Tomb, Grim Monolith, Urza's Saga) to outrace their disruption before Archon of Emeria locks us out.