Consign to Memory is premium here since it counters colorless spells outright, hitting Thought-Knot Seer, Mind Stone, Expedition Map, Kozilek's Command, and Devourer of Destiny, and its replicate mode lets one copy stop several in the same turn. Harbinger of the Seas turns Eldrazi Temple, Ugin's Labyrinth, and the Urza's lands into Islands, severely restricting the colorless mana they need to deploy their bombs on curve. Stubborn Denial is unreliable since we're rarely attacking into an established Tron board with a 4-power creature, and Street Wraith's swampwalk does nothing against their colorless-heavy manabase. Keep Thoughtseize to strip Karn, the Great Creator or Ugin, Eye of the Storms before they resolve.