In the final confrontation, Mishra merged with a dragon engine and revealed the extent of Phyrexia’s transformation. Urza confronted both his brother and the proof that their war had invited something larger onto Dominaria. Shock did not lead him back toward restraint. It convinced him that no smaller answer remained.
Urza activated the Golgothian Sylex by pouring the pain, memory and power of the land through himself. White destruction expanded across Argoth. Armies, machines and the island were erased in an event too large to distinguish combatant from witness or enemy from the world beneath them.
The blast ignited Urza’s planeswalker spark, but survival was not vindication. Coastal regions were ruined, the climate collapsed toward an Ice Age and the Multiverse around Dominaria was altered. One man escaped the consequences in a newly powerful form while countless others inherited them without choice.