Vegito’s Final Kamehameha

(You can only cast this spell if you control a legendary creature or Planeswalker)
Sacrifice a Vegito permanent you control and place a Son Goku and Prince Vegeta permanent from you hand or library onto the battlefield tapped. Destory target creature and its owner places the top X cards from the top of their library to the graveyard. X is equal to the destroyed creatures power.