Chain of Acid, and Ral, Storm Conduit

Prerequisites

• Chain of Acid in hand
• Ral, Storm Conduit on the battlefield
• You control an indestructible noncreature permanent
• available

Steps

1. Cast Chain of Acid by paying , targeting any indestructible noncreature permanent you control
2. Ral triggers, dealing 1 damage to target opponent or planeswalker
3. Allow Chain of Acid to resolve, failing to destroy the indestructible permanent and copying the spell targeting the same permanent
4. Repeat from step 2

Results

• Infinite damage
• Infinite magecraft triggers