Delney, Streetwise Lookout + Mox Amber + Kor Skyfisher + Heartless Summoning

Delney, Streetwise Lookout

Mox Amber

Kor Skyfisher

Heartless Summoning

How it works

1. Cast Mox Amber by paying 0.
2. Activate Mox Amber by tapping it, adding .
3. Cast Kor Skyfisher by paying .
4. When Kor Skyfisher enters the battlefield, it triggers twice due to Delney, returning Mox Amber and Kor Skyfisher from the battlefield to your hand.
5. Repeat.