Araumi of the Dead Tide + Kelpie Guide + Mesmeric Orb

Araumi of the Dead Tide

Kelpie Guide

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 Kelpie Guide encore until end of turn.
2. Activate Kelpie Guide's encore ability by paying 2 and exiling it, causing you to create a token copy of it with haste for each opponent you have.
3. Activate a Kelpie Guide's first ability by tapping it, untapping a different Kelpie Guide.
4. Mesmeric Orb triggers, causing you to mill a card.
5. Repeat from step 3.