You control an indestructible non-creature permanent.
({3} magic symbol) ({G} magic symbol) available.
Steps
Cast Chain of Acid by paying ({3} magic symbol) ({G} magic symbol) , targeting any indestructible non-creature permanent you control.
Sedgemoor Witch triggers, causing you to create a 1/1 Pest creature token.
Resolve Chain of Acid, failing to destroy the indestructible permanent and choosing to copy Chain of Acid, targeting the indestructible permanent with the copy.