Requires

Heidar, Rimewind Master must be on the battlefield. Parallax Tide must be in hand. Retreat to Coralhelm must be on the battlefield. High Tide must be in hand. You control at least four untapped Islands. Heidar does not have summoning sickness. You control at least four snow permanents. Mana needed:

Steps

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 .
5. Activate Parallax Tide four times by removing four fade counters from it, exiling the four tapped Islands.
6. Activate Heidar by paying 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.

Results