+"Assembly-Worker" (12)
If you would create a Clue, Food, or Treasure token, instead create one of each.
Modular 2 (This creature enters with two +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)
: Target Assembly-Worker creature gets +1/+1 until end of turn.
Vigilance
, : Put a +1/+1 counter on target Assembly-Worker you control.
//PRT-Prototype_Mech//
Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
2/2
: Create a token that's a copy of target artifact. That token gains haste. Exile it at the beginning of the next end step.
When Dutiful Replicator enters, you may pay . When you do, create a token that's a copy of target token you control not named Dutiful Replicator.
Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)
: You gain 1 life. If you control creatures named Power Plant Worker and Tower Worker, you gain 3 life instead.
Whenever you cast a historic spell, you may pay . If you do, create a token that's a copy of Mishra's Self-Replicator. (Artifacts, legendaries, and Sagas are historic.)
: Power Plant Worker gets +2/+2 until end of turn. If you control creatures named Mine Worker and Tower Worker, put two +1/+1 counters on Power Plant Worker instead. Activate only once each turn.
When Self-Assembler enters, you may search your library for an Assembly-Worker creature card, reveal it, put it into your hand, then shuffle.
Reach
: Add . If you control creatures named Mine Worker and Power Plant Worker, add instead.
Gatherer works better in the Companion app!
, 
: Put a +1/+1 counter on target Assembly-Worker you control.