Dismiss into Dream, and Goblin Sharpshooter

Prerequisites

• Dismiss into Dream on the battlefield
• Goblin Sharpshooter on the battlefield
• Goblin Sharpshooter is untapped and does not have summoning sickness

Steps

1. Activate Goblin Sharpshooter targeting a creature an opponent controls
2. That creature triggers, causing its controller to sacrifice it
3. Goblin Sharpshooter triggers, untapping itself
4. Repeat

Results

• Destroy all creatures your opponents control
• Destroy each creature your opponent plays in future