Araumi of the Dead Tide + Fatestitcher + Mesmeric Orb

Araumi of the Dead Tide

Fatestitcher

Mesmeric Orb

How it works

1. Activate Araumi by tapping it and exiling cards from your graveyard equal to the number of opponent you have, giving Fatestitcher encore until end of turn.
2. Activate Fatestitcher's encore ability by paying 3 and exiling it, causing you to create a token copy of it with haste for each opponent you have.
3. Activate a Fatestitcher by tapping it, untapping a different Fatestitcher.
4. Mesmeric Orb triggers, causing you to mill a card.
5. Repeat from step 3.