# 2021 Magic: The Gathering Commander 2021 #361

> Theoretical Duplication is a Rare Instant from the 2021 Magic: The Gathering Commander set, featuring the signature blue mana cost and strategic token-creation ability.

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## Identity

- **Year**: 2021
- **Brand**: Magic: The Gathering
- **Set**: Commander 2021
- **Card Number**: 361
- **Featured**: Theoretical Duplication
- **Game**: Magic: The Gathering
- **Rarity**: Rare
- **Mana cost**: {2}{U}
- **Type**: Instant
- **Color**: U
- **Language**: English
- **Material**: Card Stock
- **Finish**: Normal

## Description

Theoretical Duplication stands as a significant inclusion in the 2021 Magic: The Gathering Commander release, offering a unique strategic advantage for players who enjoy board states filled with creature tokens. As card number 361 in the set, this Rare Instant requires two generic mana and one blue mana to cast, fitting neatly into decks built around the blue color identity. Its mana value of three allows for consistent casting without relying on complex mana bases, making it a reliable tool for controlling the game flow.

The card’s effect triggers whenever a nontoken creature controlled by an opponent enters the battlefield during the turn. When this happens, Theoretical Duplication creates a token copy of that creature, effectively turning an opponent’s aggressive plays into additional assets for the caster. This mechanic encourages strategic thinking, as players must weigh the immediate benefit of playing creatures against the risk of granting their opponent even more presence on the board. It is a card that rewards patience and timing, appealing to collectors and players who appreciate interactive gameplay mechanics.

Created by artist Anna Christenson, Theoretical Duplication is part of the growing collection of Commander staples that continue to influence modern gameplay. The card’s design and functionality make it a sought-after piece for enthusiasts of the Magic: The Gathering trading card game. Whether you are building a competitive deck or simply expanding your library, this card represents a clever interaction that adds depth to the Commander format. Its presence in the 2021 set highlights Wizards of the Coast’s commitment to innovative card design that challenges players to think several moves ahead. For collectors, Theoretical Duplication offers a tangible connection to a pivotal moment in the Commander product line, serving as both a functional game piece and a valuable addition to any serious collection.

## FAQ

### What does Theoretical Duplication do in Magic: The Gathering?

Theoretical Duplication is an Instant that creates a token copy of any nontoken creature an opponent controls whenever it enters the battlefield during that turn. This allows you to gain control of opposing creatures as tokens, shifting board advantage in your favor.

### Who is the artist for Theoretical Duplication?

Anna Christenson is the credited artist for Theoretical Duplication in the 2021 Commander set. Her work contributes to the visual identity of the Magic: The Gathering trading card game.

### What is the mana cost of Theoretical Duplication?

Theoretical Duplication has a mana cost of two generic mana and one blue mana, resulting in a total mana value of three. It belongs to the blue color identity in the game.

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Editorial content updated: 2026-09-28.

Site deployment: 2025-11-29.