Ayara's Oathsworn + Beacon of Tomorrows + Clockspinning

Ayara's Oathsworn

Beacon of Tomorrows

Clockspinning

How it works

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 3, removing a +1/+1 counter from Ayara's Oathsworn and returning Clockspinning to your hand.
4. Cast Beacon of Tomorrows by paying 6, causing you to take an extra turn after this one, and shuffle Beacon of Tomorrows into your library.
5. Repeat each turn.