The Chain Veil, Chandra, Hope's Beacon, Chandra, Bold Pyromancer, and Tezzeret the Seeker

Prerequisites

• The Chain Veil on the battlefield
• Chandra, Hope's Beacon on the battlefield
• Chandra, Bold Pyromancer on the battlefield
• Tezzeret the Seeker on the battlefield

Steps

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

Results

• Infinite activations of loyalty abilities of all other Planeswalkers you control
• Infinite damage
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control