Jon Irenicus, Shattered One, and Ronom Serpent

Prerequisites

• Jon Irenicus, Shattered One on the battlefield
• Ronom Serpent on the battlefield
• Assault Suit attached to Ronom Serpent
• A player controls no snow lands

Steps

1. At the beginning of your end step, Jon Irenicus triggers, giving control of Ronom Serpent to an opponent who controls no snow lands
2. When Ronom Serpent's controller controls no snow lands, Ronom Serpent triggers, causing them to sacrifice it
3. However, Ronom Serpent cannot be sacrificed due to its ability
4. Ronom Serpent triggers again, creating a mandatory infinite loop that causes the game to end in a draw

Results

• Draw the game