The thing that places them so high on the list though, is that you can then pay seven mana, one of which has to White, Blue, Black, Red, and Green, to exile the top three cards of your library, and you can then play them without paying their mana costs
Well Ive got another cheat code for you, enter Potomac Distribution
The first three are obviously absurdly good, the Staff can be painful but well worth it if you can offset the lifeloss with Venser's lifegain
This can be very strong on its own because it means that opposing players will have to discard some of their cards if Kefka is left unattended, and the user can discard valuable combo pieces in order to later retrieve them with the Commander staple called Underworld Breach, particularly if comboed with Lion's Eye Diamond to create infinite mana and then win the game
Mims are simply the most popular ways of activating them, but cards like Bounce or Bibbidi Bobbidi Boo could see play in those slots if the Mims ever found a reason to fall out of favor