Kefka, Dancing Mad Commander deck

During your turn, Kefka has indestructible. At the beginning of your end step, exile a card at random from each opponent's graveyard. You may cast any number of spells from among cards exiled this way without paying their mana costs. Then each player who owns a spell you cast this way loses life equal to its mana value.

Based on 6 real Kefka decks and 12 similar commanders.