Malcolm, Keen-Eyed Navigator + Runed Stalactite + Reckless Fireweaver

Malcolm, Keen-Eyed Navigator

Runed Stalactite

Reckless Fireweaver

How it works

1. Cause an artifact to enter the battlefield under your control.
2. Reckless Fireweaver triggers, dealing 1 damage to each opponent.
3. Malcolm triggers, as Reckless Fireweaver is a Pirate due to Runed Stalactite, creating a Treasure token for each opponent dealt damage this way.
4. When the Treasure(s) enter, Reckless Fireweaver triggers that many times.
5. Resolve the first Reckless Fireweaver trigger, dealing 1 damage to each opponent.
6. Repeat from step 3.