Ghyrson Starn, Kelermorph, Temple Altisaur, Silverclad Ferocidons, and Spark Double

Prerequisites

• Ghyrson Starn, Kelermorph on the battlefield
• Temple Altisaur on the battlefield
• Silverclad Ferocidons on the battlefield
• Spark Double on the battlefield
• You have a way to give Silverclad Ferocidons indestructible
• You have a way to deal damage to Silverclad Ferocidons

Steps

1. Give Silverclad Ferocidons indestructible by any method
2. Deal damage to Silverclad Ferocidons, with all but 1 of that damage being prevented by Temple Altisaur
3. Silverclad Ferocidons, Ghyrson Starn, and Spark Double trigger
4. Resolve the Spark Double trigger, dealing 2 damage to any target
5. Resolve the Ghyrson Starn trigger, dealing 2 damage to Silverclad Ferocidons, with all but 1 of that damage being prevented by Temple Altisaur
6. Spark Double and Silverclad Ferocidons trigger
7. Resolve the Silverclad Ferocidons trigger, causing each opponent to sacrifice a permanent
8. Resolve the Spark Double trigger, dealing 2 damage to Silverclad Ferocidons, with all but 1 of that damage being prevented by Temple Altisaur
9. Ghyrson Starn and Silverclad Ferocidons trigger
10. Repeat from step 5

Results

• Each opponent sacrifices all permanents they control