Can you enchant a creature you don't control?

It doesn't matter who controls the permanent that the Aura is enchanting. A permanent's controller is whoever put it into play unless the spell or ability that put the permanent into play states otherwise.

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Regarding this, how does lifelink work mtg?

If a creature has lifelink, any amount of damage it deals allows its controller to gain that much life. And that's any damage: combat and non-combat damage alike. So, if your creature with lifelink "fights" another creature outside of combat or deals damage via an activated ability, you'll still gain the life! Is enchant creature an ability? Enchant is a keyword ability that restricts what an Aura can target and be attached to.

Accordingly, can mirage mirror copy aura?

Mirage Mirror will wind up as a copy of the permanent targeted by the last ability to resolve. 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. Moreover, do clones copy counters? It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on.

Thereof, can clever impersonator copy a planeswalker?

If Clever Impersonator enters the battlefield as a copy of a planeswalker, it will enter the battlefield with a number of loyalty counters on it equal to the loyalty printed in the lower right corner of the planeswalker card. It won't copy the number of loyalty counters on the original planeswalker. Accordingly, can 2 creatures block 1 attacker? Each creature can only block a single attacker, but the defending player may choose to block an attacking creature with more than one creature. Both players are given a chance to cast instants and activate abilities after blockers have been declared.

Correspondingly, do board wipes work on indestructible?

Examples of indestructibl. Creatures with indestructible are popular in Magic, especially in formats like Commander where board stalls and board wipes are common.