Darksteel Garrison #167
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Card Details
Fortified land has indestructible.
Whenever fortified land becomes tapped, target creature gets +1/+1 until end of turn.
Fortify 
Illustrated by David Martin
Rulings (4)
May 1, 2007
Fortification is to lands what Equipment is to creatures. Except for the difference regarding what kind of permanent it can affect, Fortifications and Equipment follow the same rules.
May 1, 2007
If Darksteel Garrison and the fortified land would be destroyed at the same time, only Darksteel Garrison is destroyed.
May 1, 2007
The second ability triggers whenever the fortified land becomes tapped, not just when it's tapped for mana.
May 1, 2007
The triggered ability is mandatory. If you don't have a creature to target, you must target another player's creature, if possible.