Deep-Slumber Titan, Elemental Mastery, and Warstorm Surge

Prerequisites

• Deep-Slumber Titan on the battlefield
• Elemental Mastery on the battlefield
• Warstorm Surge on the battlefield
• Elemental Mastery attached to Deep-Slumber Titan
• Deep-Slumber Titan does not have summoning sickness
• You have a way to give Deep-Slumber Titan indestructible

Steps

1. Give Deep-Slumber Titan indestructible, if needed
2. Activate Deep-Slumber Titan by tapping it, creating seven 1/1 Elemental creature tokens
3. When the Elementals enter the battlefield, Warstorm Surge triggers that many times
4. Resolve the first Warstorm Surge trigger, dealing 1 damage to Deep-Slumber Titan
5. Deep-Slumber Titan triggers, untapping itself
6. Resolve all remaining Warstorm Surge triggers, dealing 6 damage divided among any number of targets
7. Repeat from step 2

Results

• Infinite creature tokens
• Infinite damage
• Infinite ETB