How can you create a combo with Emeria Shepherd, Parallax Tide, Seal of Cleansing?
user
[START OF COMBO]This combo can be formed with Emeria Shepherd, Parallax Tide, Seal of Cleansing

Color identity: WU
Mana cost: 
Steps:
  1. Activate two Plains and up to three other lands you control by tapping them, adding at least {W}{W}.
  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.[END OF COMBO STEPS]

Result:
  - Infinite blinking of lands you control
  - Infinite landfall triggers
  - Infinite mana lands you control can produce[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control at least two basic Plains.
  - Parallax Tide has at least two fade counters on it.
[END OF COMBO PREREQUISITES]
assistant