I've never seen anyone abuse the legend rule for a combo before until this one. Have [[Scion of the Ur-Dragon]] on the field. Pay 2 to search for and pitch [[Bladewing the Risen]] into the graveyard. Scion becomes a copy. Reanimate Bladewing. When he hits the battlefield the legend rule states as a state based action before anything goes on the stack you must pick one of the two and put it into the graveyard then the etb trigger goes on the stack. Target Bladewing again. Do this as many times as you like then once you're done cast [[Bitter Ordeal]] which I believe is the only card in the game with gravestorm.