Heidar, Rimewind Master + Parallax Tide + Retreat to Coralhelm + High Tide

Heidar, Rimewind Master

Parallax Tide

Retreat to Coralhelm

High Tide

How it works

1. Cast High Tide by paying .
2. Activate four Islands by tapping them, adding .
3. High Tide triggers, adding .
4. Cast Parallax Tide by paying 2.
5. Activate Parallax Tide four times by removing four fade counters from it, exiling the four tapped Islands.
6. Activate Heidar by paying 2 and tapping it, returning Parallax Tide from the battlefield to your hand.
7. When Parallax Tide leaves the battlefield, it triggers, returning all cards exiled with it to the battlefield.
8. When the Islands enter the battlefield, Retreat to Coralhelm triggers four times, untapping Heidar, and allowing you to untap up to three other creatures you control and/or scry 1 up to three times.
9. Repeat from step 2.