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)

502.65a.

Fortify is an activated ability of Fortification cards. "Fortify [cost]" means "[Cost]: Attach this Fortification to target land you control. Play this ability only any time you could play a sorcery."