Enchant creature Whenever enchanted creature becomes tapped, put a -0/-2 counter on it.
Official Rulings for Spirit Shackle
10/1/2009 : Spirit Shackle's ability triggers only when the enchanted creature changes from untapped to tapped. If Spirit Shackle enters the battlefield attached to an already tapped creature, it won't do anything (until that creature untaps and becomes tapped again, that is).
Comments on Spirit Shackle
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