Ayara's Oathsworn + Beacon of Tomorrows + Hex Parasite

Ayara's Oathsworn

Beacon of Tomorrows

Hex Parasite

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. Activate Hex Parasite by paying 1B/P, removing a +1/+1 counter from Ayara's Oathsworn and giving Hex Parasite +1/+0 until end of turn.
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.