The Chain Veil, Tezzeret the Seeker, Ral Zarek, and Basalt Monolith

Prerequisites

• The Chain Veil on the battlefield
• Tezzeret the Seeker on the battlefield
• Ral Zarek on the battlefield
• Basalt Monolith on the battlefield

Steps

1. Activate Basalt Monolith's first ability by tapping it, adding
2. Activate Tezzeret's first loyalty ability by putting a loyalty counter on it, untapping The Chain Veil and Basalt Monolith
3. Activate Basalt Monolith's first ability by tapping it, adding
4. Activate Ral Zarek's first loyalty ability by putting a loyalty counter on it, tapping any permanent and untapping Basalt Monolith
5. Activate The Chain Veil by paying and tapping it, allowing you an additional activation of your planeswalkers' loyalty abilities this turn
6. Repeat

Results

• Infinite activations of loyalty abilities of all other Planeswalkers you control
• Infinite colorless mana
• Infinite mana permanents you control can produce
• Infinite untap of permanents you control