Donna Noble, and Guilty Conscience

Prerequisites

• Donna Noble on the battlefield
• Guilty Conscience on the battlefield
• Guilty Conscience attached to Donna Noble
• You have a way to give Donna Noble indestructible
• You have a way to deal damage to Donna Noble

Steps

1. Give Donna Noble indestructible, if needed, and then deal damage to it
2. Donna Noble triggers, dealing that much damage to an opponent
3. Guilty Conscience triggers, dealing that much damage to Donna Noble
4. Repeat from step 2

Results

• Infinite damage