Malcolm, Keen-Eyed Navigator + Xenograft + Ingenious Artillerist

Malcolm, Keen-Eyed Navigator

Xenograft

Ingenious Artillerist

How it works

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