Dominus Astra Detonation

This spell costs {3} less to cast if there are ten or
more nonland permanents on the battlefield.
Destroy all nonland permanents, exile all
nonland permanents, then exile all graveyards.
The Dominus Astra was an Emperor Class
Battleship. During the Battle for Macragge, it flew straight to the heart of the Tyranid Hive Fleet
Behemoth and detonated its Warp Drives, dragging
the entire Tyranid fleet along with itself into the Warp.