Indestructibility, Furnace of Rath, and Spitemare

Prerequisites

• Indestructibility on the battlefield
• Furnace of Rath on the battlefield
• Spitemare on the battlefield
• Indestructibility attached to Spitemare
• You can deal damage to Spitemare

Steps

1. Deal damage to Spitemare
2. Spitemare triggers, dealing double that damage to itself
3. Repeat step 2 an arbitrarily large amount of times
4. Spitemare triggers, dealing an arbitrarily large amount of damage to any target

Results

• Infinite damage to a single target