Silverclad Ferocidons, and Mayhem Devil

Prerequisites

• Silverclad Ferocidons on the battlefield
• Mayhem Devil 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, if needed, then deal any amount of damage to it
2. Silverclad Ferocidons triggers, causing each opponent to sacrifice a permanent
3. Mayhem Devil triggers for each permanent sacrificed this way
4. Resolve the first trigger, dealing 1 damage to Silverclad Ferocidons
5. Repeat from step 2 until no opponent controls a permanent
6. Resolve all remaining Mayhem Devil triggers, dealing that much damage divided as you choose among any number of targets

Results

• Each opponent sacrifices all permanents they control
• Near-infinite damage