You have at least three other cards in your graveyard.
You control up to three lands that can tap to produce at least ({2} magic symbol) ({U} magic symbol) .
Steps
Activate up to three lands by tapping them, adding at least ({2} magic symbol) ({U} magic symbol) .
Cast
Frantic Search for its escape cost by paying ({2} magic symbol) ({U} magic symbol) and exiling three other cards from your graveyard, causing you to loot twice and untap three lands.
Mesmeric Orb triggers three times, causing you to mill three cards.