Quickling and Faerie Impostor in hand or on the battlefield.
You control up to two lands that can tap to produce at least ({1} magic symbol) ({U} magic symbol) .
Either Quickling or Faerie Impostor must be in your hand, with the other on the battlefield.
Steps
Activate up to two lands by tapping them, adding at least ({1} magic symbol) ({U} magic symbol) .
Cast Cloud of Faeries by paying ({1} magic symbol) ({U} magic symbol) .
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} magic symbol) ({U} magic symbol) .
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.