Malcolm, Keen-Eyed Navigator, Reckless Fireweaver, and Xenograft

Prerequisites

• Malcolm, Keen-Eyed Navigator on the battlefield
• Reckless Fireweaver on the battlefield
• Xenograft on the battlefield
• "Pirate" chosen with Xenograft
• You have a way to cause an artifact to enter the battlefield under your control

Steps

1. Cause an artifact to enter the battlefield under your control
2. Reckless Fireweaver triggers, dealing 1 damage to each opponent
3. Malcolm triggers, creating a Treasure token for each opponent dealt damage this way
4. The Treasures enter the battlefield, triggering Reckless Fireweaver that many times
5. Resolve the first Reckless Fireweaver trigger, dealing 1 damage to each opponent
6. Repeat from step 3

Results

• Infinite colored mana
• Infinite damage
• Infinite Treasure tokens