Planeswalker War
From MTG Salvation Wiki
The Planeswalker War was a tremendous, yet mysterious war that took place on Corondor shortly before the Phyrexian Invasion following the events in Wayfarer.
The war was triggered by Ravidel, but included such powerful planeswalkers as Leshrac, Tevesh Szat, Kristina, Jared Carthalion, Geyadrone Dihada, and Dakkon Blackblade, and probably many more. Little is known about the Planeswalker War, however, due to the cancellation of Magic's line of comic books. Several characters from that conflict have yet to appear in any other novels or storylines, leading many to speculate that these characters may have perished in the war. However, this is mere speculation.
Among storyline fans, the Planeswalker War is one of the most-discussed storylines that never came about.

