Jon Irenicus, Shattered One, and Bog Serpent

Prerequisites

• Jon Irenicus, Shattered One on the battlefield
• Bog Serpent on the battlefield
• An opponent controls no Swamps

Steps

1. At the beginning of your end step, Jon Irenicus triggers, causing an opponent who controls no Swamps to gain control of Bog Serpent
2. Bog Serpent triggers, causing the opponent to sacrifice it
3. However, Bog Serpent cannot be sacrificed due to its ability granted by Jon Irenicus
4. Bog Serpent triggers again, creating a mandatory infinite loop that causes the game to end in a draw

Results

• Draw the game