Malcolm, Keen-Eyed Navigator, Ingenious Artillerist, and Maskwood Nexus

Prerequisites

• Malcolm, Keen-Eyed Navigator on the battlefield
• Ingenious Artillerist on the battlefield
• Maskwood Nexus on the battlefield
• 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. Ingenious Artillerist 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 Ingenious Artillerist that many times
5. Resolve the first Ingenious Artillerist trigger, dealing 1 damage to each opponent
6. Repeat from step 3

Results

• Infinite colored mana
• Infinite damage
• Infinite Treasure tokens