Chain of Acid + Ral, Storm Conduit

Chain of Acid

Ral, Storm Conduit

How it works

1. Cast Chain of Acid by paying 3, 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.