Magic: The Gathering Comprehensive Rules Changes - Planar Chaos to Future Sight

Old rule (Planar Chaos)	New rule (Future Sight)
Fortify [Click to view all changes.]
	Fortify Fortify is an activated ability. "Fortify [cost]" means "[Cost]: Attach this Fortification to target land you control. Play this ability only any time you could play a sorcery." See rule 502.65, "Fortify," and rule 212.2, "Artifacts."

Old rule (Planar Chaos)

New rule (Future Sight)

Fortify

Fortify is an activated ability. "Fortify [cost]" means "[Cost]: Attach this Fortification to target land you control. Play this ability only any time you could play a sorcery." See rule 502.65, "Fortify," and rule 212.2, "Artifacts."