Retreat to Coralhelm + Scaled Herbalist + Oboro, Palace in the Clouds

Retreat to Coralhelm

Scaled Herbalist

Oboro, Palace in the Clouds

How it works

1. Activate Scaled Herbalist by tapping it, putting Oboro from your hand onto the battlefield.
2. When Oboro enters the battlefield, Retreat to Coralhelm triggers, untapping Scaled Herbalist.
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.