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Prototype {1}{W} — 2/2 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Vigilance {1}, {T}: Put a +1/+1 counter on target Assembly-Worker you control.
Abilities, attacks, weakness & resistance
Other cards from The Brothers' War Promos
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Autonomous Assembler (PBRO-34p foil) is an Artifact Creature — Assembly-Worker from The Brothers' War Promos. It has Prototype {1}{W} allowing it to be cast as a 2/2 for that cost, and normally is a 4/5 with vigilance and an activated ability that can put +1/+1 counters on another Assembly-Worker. Its role is team support and board development by growing other Assembly-Workers while providing a vigilant body itself.
Catalog pricing data as of 21 Apr 2026, 06:09
