Malcolm, Keen-Eyed Navigator, Mayhem Devil, and Runed Stalactite

Prerequisites

• Malcolm, Keen-Eyed Navigator on the battlefield
• Mayhem Devil on the battlefield
• Runed Stalactite on the battlefield
• You control at least one Treasure token
• Runed Stalactite attached to Mayhem Devil

Steps

1. Activate a Treasure token by tapping and sacrificing it, adding one mana of any color
2. Mayhem Devil triggers, dealing 1 damage to an opponent
3. Malcolm triggers, creating a Treasure token
4. Repeat

Results

• Infinite colored mana
• Infinite damage