Autonomous Assembler
The Brothers' War Promos (PBRO #34p)
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Autonomous Assembler
CMC: 5
Type
Artifact Creature — Assembly-Worker
Rules Text
Prototype 
— 2/2 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
Vigilance
, 
: Put a +1/+1 counter on target Assembly-Worker you control.
P/T
4/5
Printing
The Brothers' War Promos (PBRO #34p)
rare
Illustrated by Slawomir Maniak