Artefato
As permanentes não de terreno que você controla são artefatos além de seus outros tipos. O mesmo vale para mágicas de permanente que você controla e cards de permanente não de terreno que você possua e não estejam no campo de batalha.
Encroaching Mycosynth's ability causes Auras to become artifacts. This makes it more likely that another effect (such as that of March of the Machines) will make those artifact Auras into creatures. An Aura that's also a creature can't enchant anything. It's unattached the next time state-based actions are checked, and then immediately put into its owner's graveyard as a second state-based action.