How it works
Prerequisites
- You control at least four untapped Islands.
- Heidar does not have summoning sickness.
- You control at least four snow permanents.
- An Island exiled by Extraplanar Lens.
Steps
- 1Activate four Islands by tapping them, adding .
- 2Extraplanar Lens triggers, adding .
- 3Cast Parallax Tide by paying .
- 4Activate Parallax Tide four times by removing four fade counters from it, exiling the four tapped Islands.
- 5Activate Heidar by paying and tapping it, returning Parallax Tide from the battlefield to your hand.
- 6When Parallax Tide leaves the battlefield, it triggers, returning all cards exiled with it to the battlefield.
- 7When 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.
- 8Repeat from step 2.
Commander brackets
In which brackets is this combo allowed, per Spellbook's Exhibition tier?