Grasp of the Hieromancer

Oracle Text

Enchant creature

Enchanted creature gets +1/+1 and has "Whenever this creature attacks, tap target creature defending player controls."

Card Rulings

6/22/2015 The triggered ability granted to the enchanted creature will tap the creature before blockers are declared.
6/22/2015 The enchanted creature is the source of the triggered ability it gains, not Grasp of the Hieromancer. If the enchanted creature isn’t white, that ability can target a creature with protection from white, for example.