Heidar, Rimewind Master + Parallax Tide + Retreat to Coralhelm + Extraplanar Lens Combo

Parallax Tide in hand.

All other permanents on the battlefield.

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.

Activate four Islands by tapping them, adding .

Extraplanar Lens triggers, adding .

Cast Parallax Tide by paying .

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

Activate Heidar by paying and tapping it, returning Parallax Tide from the battlefield to your hand.

When Parallax Tide leaves the battlefield, it triggers, returning all cards exiled with it to the battlefield.

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.

Repeat from step 2.

Infinite blinking of lands

Infinite landfall triggers

Infinite mana basic lands you control can produce

Infinite mana creatures you control can produce

Infinite scry 1

Infinite storm count

Infinite untap of creatures you control