Activate up to two lands by tapping them, adding at least {1}{U}.
Cast Cloud of Faeries by paying {1}{U}.
Archmage of Echoes triggers, copying Cloud of Faeries.
Resolve the copy of the Cloud of Faeries spell, creating a token copy of it.
When the Cloud of Faeries token enters the battlefield, it triggers, untapping up to two lands.
Activate up to two lands by tapping them, adding at least {1}{U}.
Resolve the original Cloud of Faeries spell.
When Cloud of Faeries enters the battlefield, it triggers, untapping up to two lands.
Cast either Quickling or Faerie Impostor from your hand by paying its mana cost.
Archmage of Echoes triggers, copying the Quickling or Faerie Impostor spell.
Resolve the copy of the Quickling or Faerie Impostor spell, creating a token copy of it.
When the Quickling or Faerie Impostor token enters the battlefield, it triggers, returning Quickling or Faerie Impostor from the battlefield to your hand.
Resolve the original Quickling or Faerie Impostor spell.
When Quickling or Faerie Impostor enters the battlefield, it triggers, returning Cloud of Faeries from the battlefield to your hand.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite storm count

Infinite creature tokens

Infinite mana lands you control can produce

Infinite untap of lands you control

Archmage of Echoes

Quickling

Cloud of Faeries

Faerie Impostor

Activate up to two lands by tapping them, adding at least {1}{U}.
Cast Cloud of Faeries by paying {1}{U}.
Reflections of Littjara triggers, copying Cloud of Faeries.
Resolve the copy of the Cloud of Faeries spell, creating a token copy of it.
When the Cloud of Faeries token enters the battlefield, it triggers, untapping up to two lands.
Activate up to two lands by tapping them, adding at least {1}{U}.
Resolve the original Cloud of Faeries spell.
When Cloud of Faeries enters the battlefield, it triggers, untapping up to two lands.
Cast either Quickling or Faerie Impostor from your hand by paying its mana cost.
Reflections of Littjara triggers, copying the Quickling or Faerie Impostor spell.
Resolve the copy of the Quickling or Faerie Impostor spell, creating a token copy of it.
When the Quickling or Faerie Impostor token enters the battlefield, it triggers, returning Quickling or Faerie Impostor from the battlefield to your hand.
Resolve the original Quickling or Faerie Impostor spell.
When Quickling or Faerie Impostor enters the battlefield, it triggers, returning Cloud of Faeries from the battlefield to your hand.
Repeat.

Reflections of Littjara

Cast Faerie Impostor by paying {U}.
Faerie Impostor and Dual Nature's first ability trigger.
Resolve the Dual Nature ability, creating a token copy of Faerie Impostor.
The Faerie Impostor token triggers, returning the nontoken Faerie Impostor from the battlefield to your hand.
Dual Nature's second ability triggers.
In response, sacrifice the token Faerie Impostor to Phyrexian Altar for {U}.
Resolve the Dual Nature ability, exiling zero creatures.
Resolve the Faerie Impostor ability, returning a creature you control from the battlefield to your hand if desired.
Repeat.

Combos with "Faerie Impostor"