Goblin Sharpshooter + Quietus Spike

Goblin Sharpshooter
Quietus Spike

Requires
All permanents on the battlefield. Quietus Spike attached to Goblin Sharpshooter. Goblin Sharpshooter does not have summoning sickness.
Steps
  1. Activate Goblin Sharpshooter by tapping it, dealing 1 damage to target creature
  2. That creature dies from lethal damage due to Goblin Sharpshooter's deathtouch ability
  3. Goblin Sharpshooter triggers, untapping itself
  4. Repeat for each creature opponents control and whenever an opponent controls a creature
Results
Destroy all creatures opponents control. From now on, destroy any creatures opponents controls at instant speed.