Cause an artifact to enter the battlefield under your control.
Weftstalker Ardent triggers, dealing 1 damage to each opponent.
Malcolm triggers, as Weftstalker Ardent is a Pirate due to Rukarumel, creating a Treasure token for each opponent dealt damage this way.
When the Treasure(s) enter, Weftstalker Ardent triggers that many times.
Resolve the first Weftstalker Ardent trigger, dealing 1 damage to each opponent.
Repeat from step 3.
This elegant loop transforms the simple act of an artifact entering the battlefield into a devastating, self-sustaining engine of doom. Rukarumel, Biologist acts as the linchpin, bestowing the chosen Sliver creature type onto Weftstalker Ardent so that it is rightfully recognized as a Pirate alongside its other types. Because of this shared identity, whenever Weftstalker Ardent triggers its damage ability upon another artifact or creature entering, Malcolm, Keen-Eyed Navigator sees those Pirates dealing damage and showers you with Treasure tokens. Those very same Treasures entering the battlefield then trigger Weftstalker Ardent all over again, feeding the loop infinitely to burn out your opponents and generate boundless mana.