Kataki, Wars Wage I could likely justify Katakis inclusion on this list from its prolonged sideboard use across Legacy, Vintage and Modern
That player loses the game if they own three or more exiled cards with hit counters on them
This gets even nuttier should you time playing Cyberdrive Awakener at the right time
Some players also use it in frog decks for flavor reasons, even though Sab-Sunen doesnt have the frog creature type
It shuts down other effects as well - your opponents can't cast spells from anywhere other than their hands, so no casting spells using Madness, Plot, Mayhem, or a whole bunch of red impulse draw effects
Keep in mind that if you have a Battle or Planeswalker out, your opponents can attack them with all the creatures they like