Spell
Template:Navigation CRA spell has two meanings; one technical and one casual
Technical: Comprehensive Rules
A spell is any card that has been played and thus placed on the stack. A card is only a spell when it is on the stack.
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Casual
Originally the game was considered to have six basic kind of spells: Summons, enchantments, sorceries, instants, interrupts and artifacts [1].
Nowadays, spell is the collective term for all non-permanents. This includes: sorceries, instants and the obsoleted mana sources and interrupts.