Opalescence | Yenna, Redtooth Regent | Doubling Season (and two other cards)

Cards

({7} magic symbol) ({U} magic symbol) , plus enough mana to cast the double-faced creature or enchantment available.

Activate
Yenna by paying ({2} magic symbol) and tapping it, creating two token copies of
Doubling Season.
Cast
Infinite Reflection by paying ({5} magic symbol) ({U} magic symbol) , attaching it to
Jugan Defends the Temple.
When
Infinite Reflection enters the battlefield, it triggers, causing each nontoken creature you control to become a copy of
Jugan Defends the Temple.
Cast any transforming double-faced creature or enchantment card by paying its mana cost, causing it to enter the battlefield as a copy of
Jugan Defends the Temple with four chapter counters due to
Infinite Reflection and the
Doubling Season tokens.
The creature or enchantment's first, second and third chapter abilities trigger.
Resolve the first and second triggers, creating four 1/1 Monk creature tokens and putting four +1/+1 counters on up to two creatures.
Resolve the third trigger, exiling the creature or enchantment, and returning it to the battlefield transformed as a copy of
Jugan Defends the Temple with four chapter counters due to
Infinite Reflection and the
Doubling Season tokens.
Repeat from step 5.
NOTE: This combo creates a mandatory infinite loop that must be interrupted, or the game will end in a draw.

This combo has been estimated to be Exhibition (Bracket 1+).