Resources

Magic: The Gathering Comprehensive Rules Changes

Planar Chaos to Future Sight (Single Change View)

General changes

Old rule (Planar Chaos) New rule (Future Sight)

Fortification

Some artifacts have the subtype "Fortification." These artifacts can be attached to (can "fortify") lands. They can't fortify objects that aren't lands. A Fortification is played and comes into play just like any other artifact. Fortification doesn't come into play fortifying a land. The fortify keyword ability moves the Fortification onto a land you control. (See rule 502.65, "Fortify.") The land a Fortification is attached to is called "fortified." The Fortification is attached to, or "fortifies," that land. A Fortification that's also a creature or a Fortification that loses the subtype "Fortification" can't fortify a land. A Fortification can't fortify itself. A Fortification that fortifies an illegal or nonexistent permanent becomes unattached from that permanent, but remains in play. (This is a state-based effect. See rule 420.)