What happens if you copy an aura?

If Mirage Mirror becomes a copy of an Aura, it's put into its owner's graveyard unless it's somehow attached to an appropriate object or player already. If it becomes a copy of an Equipment and is attached to a creature, it'll become unattached when it becomes a non-Equipment artifact again.

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Do auras go to graveyard MTG?

See rule 704.) 303.4d An Aura can't enchant itself. If this occurs somehow, the Aura is put into its owner's graveyard. If this occurs somehow, the Aura becomes unattached, then is put into its owner's graveyard. Is an enchantment a permanent? An enchantment is a permanent. See rule 303, "Enchantments." See also Aura. 303.1. A player who has priority may cast an enchantment card from their hand during a main phase of their turn when the stack is empty.

Moreover, does equipment get destroyed when creature dies?

If an equipped creature dies or gets bounced, the equipment stays in play, and you can equip it the next time you can play a sorcery. Regarding this, what happens to equipment when creature dies? Nothing. It stays on the battlefield, not equipped to anything.

In respect to this, who controls enchant player?

The player who played the enchantment controls it, no matter what it is attached to. Moreover, who controls auras mtg? By default, the player who put it onto the battlefield controls it. Control of the Enchanted permanent does not dictate who controls the Aura. 303.4e An Aura's controller is separate from the enchanted object's controller or the enchanted player; the two need not be the same.

In respect to this, how many auras mtg?

There is no limit to the number of auras and/or equipment that can be attached to a creature. Scientists have calculated that the chance of anything so patently absurd actually existing are millions to one.