Ugin's Conjurant, choosing to have X=2, but paying ({0} magic symbol) due to
Ezzaroot Channeler.
Bounteous Kirin and
Kiri-Onna trigger.
Resolve the
Bounteous Kirin trigger, causing you to gain two life.
Resolve the
Kiri-Onna trigger, returning it to your hand from the battlefield.
Cast
Kiri-Onna by paying two life due to
Ezzaroot Channeler and
Defiler of Dreams.
Defiler of Dreams triggers, causing you to draw a card.
When
Kiri-Onna enters the battlefield, it triggers, returning
Ugin's Conjurant to your hand from the battlefield.
Repeat.
Once you have drawn your library, you may cast
Ugin's Conjurant with X equaling the amount of life you gained this turn to have it enter the battlefield with a large amount of +1/+1 counters, and to gain that much life due to