Malcolm, Keen-Eyed Navigator + Amoeboid Changeling + Weftstalker Ardent

Prerequisites

• You have a way to cause an artifact to enter the battlefield under your control.

Steps

1. 1Activate Amoeboid Changeling by tapping it, giving Weftstalker Ardent all creature types until end of turn.
2. 2Cause an artifact to enter the battlefield under your control.
3. 3Weftstalker Ardent triggers, dealing 1 damage to each opponent.
4. 4Malcolm triggers, as Weftstalker Ardent is a Pirate due to Amoeboid Changeling, creating a Treasure token for each opponent dealt damage this way.
5. 5When the Treasure(s) enter, Weftstalker Ardent triggers that many times.
6. 6Resolve the first Weftstalker Ardent trigger, dealing 1 damage to each opponent.
7. 7Repeat from step 4.

Effects

• Infinite colored mana
• Infinite damage
• Infinite Treasure tokens