You have at least one additional card in your graveyard for each opponent you have.
Mana Needed
({2} magic symbol) ({U} magic symbol) available.
Steps
Activate
Araumi by tapping it and exiling cards from your graveyard equal to the number of opponent you have, giving
Vizier of Tumbling Sands encore until end of turn.
Activate
Vizier of Tumbling Sands' encore ability by paying ({2} magic symbol) ({U} magic symbol) and exiling it, causing you to create a token copy of it with haste for each opponent you have.
Activate a
Vizier of Tumbling Sands by tapping it, untapping a different
Vizier of Tumbling Sands.
Mesmeric Orb triggers, causing you to mill a card.