Phyrexia exists to spread and gain control, but what should it do when there is nothing left to take? Thrissik knows. It must give birth to its destroyer. That destroyer must then take control of Phyrexia, and from it must a new destroyer be born. The cycle must continue because Phyrexia must always be improved and strengthened. With each resurrection from its own ashes, Phyrexia will be stronger than before. Thrissik seeks the Destroyer and wants to place himself as the Father of Machines because he believes he will recognize the Destroyer when it arises. He hopes that he is the Destroyer that will bring about Phyrexia's rebirth, but either way, a new Destroyer must eventually rise.
"Destroy Everything and Rebuild."