Sage of Hours + Sunbond + Celestial Force + Boon Reflection

Sage of Hours

Sunbond

Celestial Force

Boon Reflection

How it works

1. At the beginning of your upkeep, Celestial Force triggers, causing you to gain six life.
2. Sage of Hours triggers, putting six +1/+1 counters on itself.
3. Activate Sage of Hours by removing all +1/+1 counters from it, causing you to take at least one extra turn after this one.
4. Repeat each turn.