1 May 2007
It targets a creature card in the graveyard. This target is selected when putting the triggered ability on the stack. The wording specifies it has to be a card other than the Hierophant.
1 Apr 2008
If you control Sylvan Hierophant when it goes to the graveyard, you exile the Hierophant and return a creature card from your graveyard to your hand. It doesn't matter whose graveyard the Hierophant goes to.
1 Apr 2008
If Sylvan Hierophant is removed from the graveyard before the ability resolves, you still return the targeted creature card from your graveyard to your hand.