Assault Suit, and Sea Serpent

Prerequisites

• Assault Suit on the battlefield
• Sea Serpent on the battlefield
• Assault Suit attached to Sea Serpent
• A player controls no Islands

Steps

1. If needed, give control of Sea Serpent to an opponent who controls no Islands
2. When Sea Serpent's controller controls no Islands, Sea Serpent triggers, causing them to sacrifice it
3. However, Sea Serpent cannot be sacrificed due to Assault Suit
4. Sea Serpent triggers again, creating a mandatory infinite loop that causes the game to end in a draw

Results

• Draw the game