First printed in Modern Horizons 2 (2021)
All 2 prints
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Jumpstart: Historic Horizons (J21) #48, 2021 (digital)
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Modern Horizons 2 (MH2) #4, 2021
Arcbound Prototype 
Artifact Creature — Assembly-Worker
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.)
MTGO price: 0.002 TIX, the cheapest non-foil print (average sell price on GoatBots, 28 Oct 2026).
Combos
33 combos from Commander Spellbook, the most popular first.
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Viscera Seer
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Ashnod's Altar + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Carrion Feeder + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite +1/+1 counters on certain creatures, Infinite death triggers…: Antler Skulkin + Arcbound Prototype + Ashnod's Altar
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Bartolomé del Presidio + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phyrexian Altar
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Arcbound Ravager + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Umbral Collar Zealot
- Infinite artifact ETB, Infinite artifact LTB…: Altar of Dementia + Arcbound Prototype + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
- Infinite artifact ETB, Infinite artifact LTB…: Arcbound Prototype + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Woe Strider
Legality
Constructed
- Standard Not legal
- Pioneer Not legal
- Modern Legal
- Legacy Legal
- Vintage Legal
- Pauper Legal
- Future Standard Not legal
- Historic Legal
- Timeless Legal
- Alchemy Not legal
- Penny Dreadful Legal
- Premodern Not legal
- Old School 93/94 Not legal
Singleton
- Gladiator Legal
Commander formats
- Commander Legal
- Duel Commander Legal
- Pauper Commander Legal
- PreDH Not legal
- Tiny Leaders Legal
- Oathbreaker Legal
- Brawl Legal
- Standard Brawl Not legal
- Competitive Brawl Legal