Underworld Breach and Mesmeric Orb on the battlefield.
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.