Artifact — Equipment (CMC:2)
Designed by an ancient artificer, the finest Mardu bows are carved from dragon bone and strung with the wind itself.
221 KTK • ENFranz Vohwinkel
™ & © 1993—2014 Wizards of the Coast
Legal in: Modern,Khans of Tarkir Block,Legacy,Vintage,Commander
Oracle Text (click to copy):
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9/20/2014 The controller of Heart-Piercer Bow chooses the target of the triggered ability. Heart-Piercer Bow is the source of the damage, not the equipped creature. 9/20/2014 The triggered ability resolves before blockers are declared. 9/20/2014 In some rare cases, a Heart-Piercer Bow you control may be attached to a creature that’s attacking you or a planeswalker you control. In that case, you choose the target of the triggered ability, but as you are the defending player, you must choose a creature you control as the target.