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

Prerequisites

• Heidar, Rimewind Master on the battlefield
• High Tide in hand
• Parallax Tide in hand
• Retreat to Coralhelm on the battlefield
• You control at least four untapped Islands
• Heidar does not have summoning sickness
• You control at least four snow permanents
• available

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

• Infinite blinking of lands you control
• Infinite landfall triggers
• Infinite mana basic lands you control can produce
• Infinite scry 1
• Infinite storm count
• Infinite untap of creatures you control