Kefka, Dancing Mad

Most graveyard-theft effects raid your own dead; this one asks who else has been dying at the table, and turns their losses into your spellbook. The end-step trigger reaches into every opponent's graveyard at once, pulls a card at random from each, and lets you cast any number of them for free, a blowout that scales with how long the game has run and how many decks have fed the yard. Rakdos rarely gets to draw from three or four color pies simultaneously, and the random selection is what makes this a chaotic harvest rather than a surgical heist: you cast what the graveyards surrender, not what you would have picked. The symmetry-of-punishment clause is the design's second lever, routing life loss back to each spell's original owner rather than to you, so recasting a big-mana bomb someone else milled or discarded doubles as a direct-damage spell aimed at its source. The turn-restricted indestructibility hardens the body only while you hold the crackback initiative on your own turn, then leaves it exposed once your turn ends, a clean way to make a 6/6 durable through your combat and end step without making it unkillable outright. The whole package reads less like a value engine than a punishment engine: the more chaos in the graveyards, the more your end step converts other players' dead into both your win condition and their bleeding life total at once.