Halo Firing

Requires Halo Installation and Halo Activation Index on the battlefield.
Requires Halo Test Firing to be in graveyard.
Destroy all non-artifact pernaments. All players must exile all cards from hand. Discard the top 5 cards from all players' libraries.
"Why naturally the Flood is simply too dangerous to release, and mass sterilization protocols may again need to be enacted." - 343 Guilty Spark