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
Super-super-tech here would be to use Cauldron of Souls to give all the small creatures persist, perhaps even killing them automatically when they come back onto the battlefield
Prerelease events for Magic: The Gathering 's Final Fantasy set start this Friday and continue through next week
Probably still not quite good enough for tournament play, but an interesting shift in design
However, to avoid mana values climbing to extreme heights, cards can also be balanced by requiring multiple colors of mana to cast
This 4-drop is a 4/3, which is on curve for Blue and you can reduce its cost if you've cast instants and sorceries this turn