Thran Vigil + Benthic Biomancer + Shambling Shell

Prerequisites

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Steps

1. 1Put a +1/+1 counter on Benthic Biomancer.
2. 2Benthic Biomancer triggers, causing you to mill three cards and return Shambling Shell from your graveyard to your hand, and then causing you to discard Shambling Shell.
3. 3Thran Vigil triggers, putting a +1/+1 counter on Benthic Biomancer.
4. 4Repeat from step 2.

Effects

• Infinite self-mill