Agatha's Soul Cauldron, Pheres-Band Tromper, and Seeker of Skybreak

Prerequisites

• Agatha's Soul Cauldron on the battlefield
• Pheres-Band Tromper on the battlefield
• Seeker of Skybreak in exile

Steps

1. Activate Pheres-Band Tromper using Seeker of Skybreak's ability by tapping it, untapping Pheres-Band Tromper Pheres-Band Tromper triggers, putting a +1/+1 counter on it
2. Repeat

Results

• Infinite +1/+1 counters on a creature