Theoretical Duplication
Commander 2021 — Rare
Instant
Sets Theoretical Duplication has been printed in:

Commander 2021 — Rare
Instant
Sets Theoretical Duplication has been printed in:

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Creature — Faerie Artificer (2/2)
Flying
Whenever a nontoken creature an opponent controls enters, create a token that's a copy of that creature except it's an artifact in addition to its other types. Then exile all other tokens created with Faerie Artisans.
Creature — Demon (5/5)
Flying
When Overseer of the Damned enters, you may destroy target creature.
Whenever a nontoken creature an opponent controls dies, create a tapped 2/2 black Zombie creature token.
Enchantment
Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature.
Whenever a nontoken creature leaves the battlefield, exile all tokens with the same name as that creature.
When Dual Nature leaves the battlefield, exile all tokens created with Dual Nature.
Enchantment
Whenever a nontoken creature you control enters, you may pay . If you do, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step.
Artifact
Whenever a nontoken creature you control enters, you may pay . If you do, create a token that's a copy of that creature, except it has haste and "At the beginning of the end step, sacrifice this permanent."
Enchantment
Whenever a nontoken creature you control enters, flip a coin until you lose a flip. For each flip you won, create a token that's a copy of that creature. Those tokens gain haste. Exile them at the beginning of the next end step.
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