Delney, Streetwise Lookout | Mox Amber | Birgi, God of Storytelling // Harnfel, Horn of Bounty

(and one other card)

Cast
Mox Amber by paying ({0} magic symbol) .
Birgi triggers, adding ({R} magic symbol) .
Activate
Mox Amber by tapping it, adding ({U} magic symbol) .
Cast
Dream Stalker by paying ({1} magic symbol) ({U} magic symbol) .
Birgi triggers, adding ({R} magic symbol) .
When
Dream Stalker enters the battlefield, it triggers twice due to
Delney, returning
Mox Amber and
Dream Stalker from the battlefield to your hand.
Repeat.