Retreat to Coralhelm + Llanowar Scout + Oboro, Palace in the Clouds

Retreat to Coralhelm

Llanowar Scout

Oboro, Palace in the Clouds

How it works

1. Activate Llanowar Scout by tapping it, putting Oboro from your hand onto the battlefield.
2. When Oboro enters the battlefield, Retreat to Coralhelm triggers, untapping Llanowar Scout.
3. Activate Oboro's first ability by tapping it, adding .
4. Activate Oboro's second ability by paying 1, returning it from the battlefield to your hand.
5. Repeat.