Malcolm, Keen-Eyed Navigator | Stalactite Dagger | Hedron Detonator

Cards

All permanents on the battlefield (
Stalactite Dagger attached to
Hedron Detonator).

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

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