Autonomous Assembler (Extended Art) [The Brothers' War]

Set: The Brothers' War Type: Artifact Creature — Assembly-Worker Rarity: Rare Cost: {5} 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.