Chain of Acid + Ral, Storm Conduit

Prerequisites

• You control an indestructible noncreature permanent.

Steps

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

Effects

• Infinite damage
• Infinite magecraft triggers