Silverclad Ferocidons + Mayhem Devil

Prerequisites

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.