Agatha's Soul Cauldron, Siren of the Silent Song, and Tidewater Minion

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Siren of the Silent Song on the battlefield
• Tidewater Minion in exile

Steps

1. Activate Siren of the Silent Song using Tidewater Minion's ability by tapping it, untapping Siren of the Silent Song Siren of the Silent Song triggers, causing each opponent to discard and mill a card
2. Repeat

Results

• Infinite mill