Urza gathered nine planeswalkers and equipped them for a direct strike at Phyrexia. Freyalise, Lord Windgrace and other oldwalkers carried soul bombs through the plane’s layers. The mission demonstrated power on a scale ordinary armies could not approach, but its design still depended on Urza anticipating every betrayal.
Tevesh Szat killed two fellow Titans during the assault. Urza had anticipated his betrayal, executed Szat and used his essence to power soul bombs meant for Phyrexia. The response was not an improvised defence against surprise treachery: Urza had deliberately made the betrayal part of his plan. That choice exposed both his tactical foresight and the moral cost of treating an ally's life as a usable component of a weapon.
Near Yawgmoth’s centre, Urza’s hatred gave way to awe at Phyrexian artifice. Gerrard was drawn into the same confrontation, and the two were made to fight. The architect who had demanded sacrifices from everyone else could not complete his own mission. His assault left the final defence to the crew operating outside his control.