Harbinger of the Void

[Summon Requirement]: [Remove 3 ?Spawn of Nightmares? in your graveyard from the game.]. If you don't, put this into the graveyard.

"Void Nova": When this enters play, choose up to 3 enemy cards in play and remove them from the game. Then, until the end of turn, this gains +3 STK.

[Breakthrough]