Ayara's Oathsworn, Beacon of Tomorrows, and Clockspinning

Prerequisites

• Ayara's Oathsworn on the battlefield
• Beacon of Tomorrows in the library
• Clockspinning in hand
• Ayara's Oathsworn does not have summoning sickness and 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. Cast Clockspinning with buyback by paying , removing a +1/+1 counter from Ayara's Oathsworn and returning Clockspinning to your hand
4. Cast Beacon of Tomorrows by paying , causing you to take an extra turn after this one, and shuffle Beacon of Tomorrows into your library
5. Repeat each turn

Results

• Infinite turns