# 2022 Magic: The Gathering The Brothers' War Promos #34s

> This 2022 foil promotional card features the Autonomous Assembler from Magic: The Gathering's The Brothers' War set, showcasing its distinctive Assembly-Worker subtype and Prototype mechanic.

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## Identity

- **Year**: 2022
- **Manufacturer brand**: Magic: The Gathering
- **Set / series**: The Brothers' War Promos
- **Card number**: #34s
- **Product type**: TCG_CARD

## Description

The Autonomous Assembler (34s) is a sought-after foil promo from Magic: The Gathering's 2022 The Brothers' War Promos set. Designed by Slawomir Maniak, this rare Artifact Creature — Assembly-Worker brings a unique strategic element to the table with its Prototype mechanic. Players can cast the card with a reduced mana cost of {1}{W} to play a 2/2 version, or pay the full {5} to deploy the full-strength 4/5 body equipped with Vigilance. This flexibility allows collectors and players to appreciate the card's versatility in both casual and competitive environments.

As a foil finish variant, the card’s shimmering surface enhances its visual appeal, making it a standout addition to any Magic: The Gathering collection. The Brothers' War expansion captures the industrial and mechanical themes of the war-torn plane of Mirrodin, and this Assembly-Worker exemplifies that aesthetic with its intricate design and functional gameplay. Collectors often seek out such promos to complete set collections or to acquire cards with distinctive treatments like foil finishes. The Autonomous Assembler’s ability to grow stronger on the battlefield with a single mana investment adds layers of strategy, making it a memorable piece in the MTG canon. Whether you are drawn to its mechanical lore or its strategic depth, this card represents a compelling intersection of art and gameplay in the Brothers' War era.

## FAQ

### What is the Prototype mechanic on Autonomous Assembler?

Prototype allows you to cast the spell with a different mana cost, color, and size than printed. You can choose to cast it for {1}{W} as a 2/2 or for {5} as the full 4/5, keeping its abilities and types regardless of the choice.

### Is the Autonomous Assembler a foil card?

Yes, the version listed here is the foil finish variant from The Brothers' War Promos set. Foil cards feature a reflective surface treatment that distinguishes them from nonfoil versions.

### What set does the Autonomous Assembler belong to?

This card is part of the Magic: The Gathering The Brothers' War Promos set, released in 2022. It carries the card number 34s and is classified as a Rare with the set code PBRO.

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Last verified: 2025-11-29.