Perhaps you know what your next draw is and you dont want it to be sent to the bottom of your library, or you know that you wont be able to hit any more of the same card
If any color should have a revamped Crossroads (the old version was an enchant world a mechanic we didn't make any more) it should be red
Similarly, in the Final Fantasy VII deck, there was a lot of contention on whether I could add Sephiroth or not, given the deck didnt have black in the color identity
That opponent can't cast X and plays with their hand revealed., : Put X into target opponent's hand.: You may play a land or cast a spell from the hand X is in
One suspects that the value of Sonic Screwdriver may lay less in its usefulness outside of producing mana and more in its recognition among Doctor Who fans
Not that thats very much, given that its a slip of paper but still