Emeria Shepherd, Parallax Tide, and Seal of Cleansing

Prerequisites

• Emeria Shepherd on the battlefield
• Parallax Tide on the battlefield
• Seal of Cleansing on the battlefield
• You control at least two basic Plains
• Parallax Tide has at least two fade counters on it

Steps

1. Activate two Plains and up to three other lands you control by tapping them, adding at least
2. Activate Parallax Tide by removing a fade counter from it, exiling a basic Plains you control
3. Repeat step 2 one additional time
4. You may optionally repeat step 2 for any other lands you control
5. Activate Seal of Cleansing by sacrificing it, destroying Parallax Tide
6. Parallax Tide leaves the battlefield, returning all lands exiled with it to the battlefield
7. The lands enter the battlefield, triggering Emeria Shepherd that many times
8. Resolve the first Emeria Shepherd trigger, returning Seal of Cleansing from your graveyard to the battlefield
9. Resolve the second Emeria Shepherd trigger, returning Parallax Tide from your graveyard to the battlefield
10. Resolve any remaining Emeria Sherpherd triggers
11. Repeat

Results

• Infinite blinking of lands you control
• Infinite landfall triggers
• Infinite mana lands you control can produce