The Chain Veil, Chandra, Hope's Beacon, Chandra, Torch of Defiance, and Ral Zarek

Prerequisites

• The Chain Veil on the battlefield
• Chandra, Hope's Beacon on the battlefield
• Chandra, Torch of Defiance on the battlefield
• Ral Zarek on the battlefield

Steps

1. Activate Chandra, Torch of Defiance's second ability by putting a loyalty counter on it, adding
2. Activate Chandra, Hope's Beacon's first ability by putting two loyalty counters on it, adding two mana of any color
3. Activate The Chain Veil by paying and tapping it, allowing you an additional activation of your planeswalkers' loyalty abilities this turn
4. Activate Ral Zarek's first ability by putting a loyalty counter on it, tapping any permanent and untapping The Chain Veil
5. Repeat

Results

• Infinite activations of loyalty abilities of all other Planeswalkers you control
• Infinite damage