If an Equipment or Fortification is attached to an illegal permanent or to a player, it becomes unattached from that permanent or player. It remains on the battlefield.
September 29, 2017 · Ixalan
If an Equipment or Fortification is attached to an illegal permanent, it becomes unattached from that permanent. It remains on the battlefield.
February 1, 2014 · Born of the Gods
If an Aura is attached to an illegal object or player, or is not attached to an object or player, that Aura is put into its owner’s graveyard.
September 30, 2011 · Innistrad
If an Aura is attached to an illegal object or player, or is not attached to an object or player, that Aura is put into its owner's graveyard.
June 17, 2011 · Commander 2011
If an Aura is attached to an illegal object or player, or is not attached to an object or player,
April 1, 2011 · Duel Decks: Knights vs. Dragons
If an Aura is attached to an illegal object or player, or is not attached to an object or player, that Aura is put into its owner's graveyard.
February 4, 2011 · Mirrodin Besieged
If an Aura is attached to an illegal object or player, or is not attached to an object or player, that Aura is put into its owner’s graveyard.
October 1, 2010 · Scars of Mirrodin
If an Aura is attached to an illegal object or player, or is not attached to an object or player,
February 1, 2010 · Worldwake
If an Aura is attached to an illegal object or player, or is not attached to an object or player, that Aura is put into its owner's graveyard.