Agatha's Soul Cauldron + Deeproot Pilgrimage + Tidewater Minion

Agatha's Soul Cauldron
Deeproot Pilgrimage
Tidewater Minion

Requires
Agatha's Soul Cauldron must be on the battlefield. Deeproot Pilgrimage must be on the battlefield. Tidewater Minion must be in exile.
Steps
  1. Activate the nontoken Merfolk using Tidewater Minion's ability by tapping it.
  2. Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token.
  3. Resolve the Merfolk's ability, untapping it.
  4. Repeat.
Results
Infinite ETB. Infinite creature tokens.

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