Kefka, Dancing Mad is a rare Legendary Creature — Human Wizard card from Final Fantasy Commander (FIC), collector number 174. Current market price: $1.36 (foil $7.47), TCGplayer market prices via Scryfall.
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.