Khârn the Betrayer, Witch Engine, Captivating Crew, and Agatha's Soul Cauldron

Prerequisites

• Khârn the Betrayer on the battlefield
• Witch Engine in exile
• Captivating Crew on the battlefield
• Agatha's Soul Cauldron on the battlefield
• Khârn has a +1/+1 counter on it and does not have summoning sickness

Steps

1. Activate Khârn using Witch Engine's ability by tapping it, adding and causing an opponent to gain control of Khârn
2. Khârn triggers, causing you to draw two cards
3. Activate Captivating Crew by paying , causing you to gain control of Khârn
4. Khârn triggers, causing the opponent who controlled it to draw two cards
5. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Near-infinite card draw for opponents
• Near-infinite draw triggers for opponents