Chain of Acid, and Deekah, Fractal Theorist

Prerequisites

• Chain of Acid in hand
• Deekah, Fractal Theorist 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. Deekah triggers, creating a 0/0 Fractal creature token with four +1/+1 counters on it
3. Resolve Chain of Acid, failing to destroy the indestructible permanent and choosing to copy Chain of Acid, targeting the indestructible permanent with the copy
4. Repeat from step 2

Results

• Infinite creature tokens
• Infinite ETB
• Infinite magecraft triggers