Caster

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Caster is an obsolete term that used to refer to the player who cast a spell. In general, cards that were printed with the term "caster" have received errata in the Oracle card reference to say "controller"

From the glossary of the Comprehensive Rules (November 14, 2025—Avatar: The Last Airbender)

Caster (Obsolete)

An obsolete term that referred to the player who cast a spell. In general, cards that were printed with the term “caster” have received errata in the Oracle card reference to say “controller.”