Ayara's Oathsworn, Beacon of Tomorrows, and Fain, the Broker

Prerequisites

• Ayara's Oathsworn on the battlefield
• Beacon of Tomorrows in the library
• Fain, the Broker on the battlefield
• Ayara's Oathsworn and Fain do not have summoning sickness
• Ayara's Oathsworn has exactly three +1/+1 counters on it
• An opponent cannot block Ayara's Oathsworn
• each turn available

Steps

1. Deal combat damage to an opponent using Ayara's Oathsworn
2. Ayara's Oathsworn triggers, putting a +1/+1 counter on it and searching your library for Beacon of Tomorrows and putting it into your hand
3. Activate Fain's second ability by tapping it and removing a +1/+1 counter from Ayara's Oathsworn, creating a Treasure token
4. Activate the Treasure by tapping and sacrificing it, adding
5. Cast Beacon of Tomorrows by paying , causing you to take an extra turn after this one, and shuffle Beacon of Tomorrows into your library
6. Repeat each turn

Results

• Infinite turns