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

Infinite turns

Sage of Hours

Light of Promise

Celestial Force

Boon Reflection

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

Combos with "Celestial Force"