Colorless Prison aims to deploy Trinisphere on turn one off Ancient Tomb, which completely shuts down your reanimation engine since Dark Ritual into a one-mana spell is now three mana — they will frequently have this on the play before you can act. Show and Tell is your best route to victory because it lets you put Griselbrand or Atraxa into play at sorcery speed even through Trinisphere, and the opponent's artifacts cannot win a race against drawing seven cards. Koma, World-Eater comes in as an additional Show and Tell target that is virtually impossible for a Colorless deck to answer, since they cannot tap their artifacts to activate Karn abilities on your turn once Koma locks them down. Snuff Out handles Karn, the Great Creator if he resolves before you can win, preventing him from tutoring up Mycosynth Lattice or Ensnaring Bridge. Cut Thoughtseize and Cabal Therapy since hand disruption is too slow against a deck that curves Tomb into lock piece, and trim Animate Dead since Show and Tell lines don't require the graveyard.