Fiendlash, Wrathful Red Dragon, and Pariah's Shield

Prerequisites

• Fiendlash on the battlefield
• Wrathful Red Dragon on the battlefield
• Pariah's Shield on the battlefield

Steps

1. Deal damage to Wrathful Red Dragon
2. Wrathful Red Dragon and Fiendlash trigger
3. Resolve the Wrathful Red Dragon trigger, dealing damage to an applicable target
4. Resolve the Fiendlash trigger, targeting you, but dealing damage to Wrathful Red Dragon instead due to Pariah's Shield
5. Repeat from step 2

Results

• Infinite damage