Azorius Keyrune becomes a creature by its own ability and then becomes enchanted by Darksteel Mutation. During the cleanup step, does Darksteel Mutation become unattached or does it continue to make Azorius Keyrune a 0/1 artifact creature and a legal object for attachment?

The deeper technical question is about exactly how the following is interpreted:

Originally posted by CR 303.4j:

An ability of a permanent that refers to the “enchanted (object or player)” refers to whatever object or player that permanent is attached to, even if the permanent with the ability isn’t an Aura.

Does “enchanted creature” mean “enchanted object which must be a creature” or “enchanted object which is usually expected to be a creature”?

Oddly enough, this works.

Due to 303.4j, the Mutation will keep working and will make the Keyrune into a creature, even after the Keyrune's animation effect ends. So when the turn ends, the Keyrune's animation effect ends, but the Mutation will ensure that's it's still a creature, and since it's a creature, the Mutation will remain attached to it.

Nathan Long
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