Goblin Bombardment, Dualcaster Mage, and Living Death

Prerequisites

• Goblin Bombardment on the battlefield
• Dualcaster Mage in hand
• Living Death in hand
• available

Steps

1. Cast Living Death by paying its mana cost Holding priority, cast Dualcaster Mage by paying its mana cost
2. When Dualcaster Mage enters, it triggers, targeting Living Death
3. Holding priority, activate Goblin Bombardment by sacrificing Dualcaster Mage
4. Resolve the Dualcaster Mage trigger, copying Living Death Resolve the Living Death copy, causing each player to exile all creature cards from their graveyard, sacrifice all creatures they control, and returning all cards exiled this way to the battlefield under their owner's control
5. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite damage
• Infinite magecraft triggers
• Infinite recursion of creature cards in your graveyard