Colorless Prison leans on Trinisphere, and Chalice of the Void is absent here, but Karn, the Great Creator and a dense artifact suite (The One Ring, Grim Monolith, Giant's Boulder, Lotus Petal, Trinisphere) make Pulverize's 'destroy all artifacts' a strong sweeper against their mana rocks and prison pieces. Be aware it also destroys our own artifacts, and it won't touch Karn (a planeswalker), Urza's Saga (an enchantment land, though it does hit the Construct tokens Saga makes), or The One Ring (indestructible). Boseiju, Who Endures channels to destroy an artifact, enchantment, or nonbasic land an opponent controls, letting us proactively answer Trinisphere or Urza's Saga before it assembles. We trade Undercity Sewers and the fetches for Boseiju since Boseiju still taps for green, and it adds crucial interaction against their lock pieces and nonbasic-heavy manabase.