How much spot removal do you typically run in your multiplayer EDH decks? Especially without the ability to tuck troublesome commanders, how much spot removal is enough?

I really hate letting anyone draw with Consecrated Sphinx (the card I like least in all of EDH), or do most of the things involving Deadeye Navigator or Kiki-Jiki, Mirror Breaker, and I love blowing up Mana Flare after getting a boost but before my opponent can use it for his (or her) own nefarious purposes.

Of course, cards like Reclamation Sage or Acidic Slime and Shriekmaw or Bone Shredder are easy to slot into a deck, and I always run a few sweepers to reset the board.

If I'm in green I almost always pack a Krosan Grip, and in white I almost always run a Swords to Plowshares. After those two, are there any instant-speed one-for-ones that always make it into your deck?