From MTG Salvation Wiki
Aura is an enchantment subtype that has the text "Enchant [type; restriction]". Formerly, Auras were known as "enchant [type]s".
Some enchantments have the subtype "Aura." These are enchantments that must be attached to another permanent in order to change its characteristics or give it additional abilities, whether helpful or harmful.
From the Comprehensive Rules (July 1, 2009)
- 303.4. Some enchantments have the subtype “Aura.” An Aura enters the battlefield attached to an object or player. What an Aura can be attached to is restricted by its enchant keyword ability (see rule 702.5, “Enchant”). Other effects can limit what a permanent can be enchanted by.
- 303.4a An Aura spell requires a target, which is restricted by its enchant ability.
- 303.4b If an Aura is enchanting an illegal object or player, the object it was attached to no longer exists, or the player it was attached to has left the game, the Aura is put into its owner’s graveyard. (This is a state-based action. See rule 704.)
- 303.4c An Aura can’t enchant itself, and an Aura that’s also a creature can’t enchant anything. If this occurs somehow, the Aura is put into its owner’s graveyard. (This is a state-based action. See rule 704.)
- 303.4d The object or player an Aura is attached to is called enchanted. The Aura is attached to, or “enchants,” that object or player.
- 303.4e An Aura’s controller is separate from the enchanted object’s controller; the two need not be the same. Changing control of the object doesn’t change control of the Aura, and vice versa. Only the Aura’s controller can activate its abilities. However, if the Aura grants an ability to the enchanted object (with “gains” or “has”), the enchanted object’s controller is the only one who can activate that ability.
- 303.4f If an Aura is entering the battlefield under a player’s control by any means other than by resolving as an Aura spell, and the effect putting it onto the battlefield doesn’t specify the object or player the Aura will enchant, that player chooses what it will enchant as the Aura enters the battlefield. The player must choose a legal object or player according to the Aura’s enchant ability and any other applicable effects.
- 303.4g If an Aura is entering the battlefield and there is no legal object or player for it to enchant, the Aura remains in its current zone, unless that zone is the stack. In that case, the Aura is put into its owner’s graveyard instead of entering the battlefield.
- 303.4h If an effect attempts to attach an Aura on the battlefield to an object or player, that object or player must be able to be enchanted by it. If the object or player can’t be, the Aura doesn’t move.
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