Deep-Slumber Titan, Elemental Mastery, and Terror of the Peaks

Prerequisites

• Deep-Slumber Titan on the battlefield
• Elemental Mastery on the battlefield
• Terror of the Peaks 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, Terror of the Peaks triggers that many times
4. Resolve the first Terror of the Peaks trigger, dealing 1 damage to Deep-Slumber Titan
5. Deep-Slumber Titan triggers, untapping itself
6. Resolve all remaining Terror of the Peaks triggers, dealing 6 damage divided among any number of targets
7. Repeat from step 2

Results

• Infinite creature tokens
• Infinite damage
• Infinite ETB