Fortification

From MTG Salvation Wiki

Fortification is an artifact type introduced in Future Sight. A Fortification can be attached to a land following the same rules as an Equipment attached to a creature. It uses the Fortify keyword, its counterpart to Equip.

From the Comprehensive Rules: 212.2. Artifacts 212.2m Some artifacts have the subtype “Fortification.” A Fortification can be attached to a land. It can’t legally be attached to an object that isn’t a land. Rules 212.2h–k apply to Fortifications in relation to lands just as they apply to Equipment in relation to creatures. Fortification’s analog to the equip keyword ability is the fortify keyword ability. (See rule 502.65, “Fortify.”) 502.65. Fortify 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.” 502.65b For more information about Fortifications, see rule 212.2, “Artifacts.” 502.65c If a Fortification has multiple instances of fortify, any of its fortify abilities may be used.

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Card types
Groups	Supertypes	Card types	Subtypes
Spell (non-permanent)		Instant	Trap	Arcane
		Sorcery
Permanent	Basic, Legendary, Snow, World	Artifact	Equipment, Fortification, Contraption
		Creature	(...)
		Enchantment	Aura, Shrine
		Land	(...)
		Planeswalker	(...)
Miscellaneous		Tribal	(...)
		Plane	(...)
		Vanguard
Obsolete	Mono, Poly, Continuous	Interrupt, Mana Source