Agatha's Soul Cauldron, Siren of the Silent Song, and Seeker of Skybreak

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Siren of the Silent Song on the battlefield
• Seeker of Skybreak in exile

Steps

1. Activate Siren of the Silent Song using Seeker of Skybreak'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