So what would happen if I play my mercurial transformation on an enchantment aura? The aura would become a creature and, does it detach from the permanent it enchanted? And if so, does it attach back at the end of turn or will it become illegal at the end of turn?
So what would happen if I play my mercurial transformation on an enchantment aura? The aura would become a creature and, does it detach from the permanent it enchanted?
Yes, it promptly becomes unattached.
704.5. The state-based actions are as follows:
704.5p If a creature is attached to an object or player, it becomes unattached and remains on the battlefield. Similarly, if a permanent that’s neither an Aura, an Equipment, nor a Fortification is attached to an object or player, it becomes unattached and remains on the battlefield.
So in this scenario, who controls the creature? The owner of the original aura or whoever controls the creature it was on?
e.g. I play Pacifism on an opponent's creature. They play Mercurial Transformation, targeting my Pacifism. If they do this before combat, do I get an extra blocker for that turn?
You cast the Pacifism, you control the Pacifism. Nothing here even tries to change that fact. The game does not care about "whoever controls the creature it was on".
112.2. A spell’s owner is the same as the owner of the card that represents it, unless it’s a copy. In that
case, the owner of the spell is the player under whose control it was put on the stack. A spell’s
controller is, by default, the player who put it on the stack. Every spell has a controller.
608.3. If the object that’s resolving is a permanent spell, its resolution involves a single step (unless it’s
an Aura, a copy of a permanent spell, or a mutating creature spell). The spell card becomes a
permanent and is put onto the battlefield under the control of the spell’s controller.
608.3a If the object that’s resolving is an Aura spell, its resolution involves two steps. First, it
checks whether the target specified by its enchant ability is still legal, as described in rule
608.2b. (See rule 702.5, “Enchant.”) If so, the spell card becomes a permanent and is put onto
the battlefield under the control of the spell’s controller attached to the object it was targeting.
110.2. A permanent’s owner is the same as the owner of the card that represents it (unless it’s a token;
see rule 111.2). A permanent’s controller is, by default, the player under whose control it entered
the battlefield. Every permanent has a controller.
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. If an Aura enchants an object, 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.
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Why bother with mere rulings when so many answers can be found in the Rules?
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Yes, it promptly becomes unattached.
There is no reason for it to become attached to anything. It goes to the graveyard.
e.g. I play Pacifism on an opponent's creature. They play Mercurial Transformation, targeting my Pacifism. If they do this before combat, do I get an extra blocker for that turn?