Deathstrike Missile

Defender
When the Deathstrike Missile enters the battlefield, put seven counters on it and at every beginning step of your turn remove one, once all counters are remove you may fire the Deathstrike Missile for {r} which destroys all creatures, artifacts, enchantments and 10 damage to all
players.
"A last resort I wish to never see".-Backline
Command