Heart-Piercer Bow #773
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Card Details
Whenever equipped creature attacks, this Equipment deals 1 damage to target creature defending player controls.
Equip 
Illustrated by Franz Vohwinkel
Rulings (2)
Jul 12, 2019
Heart-Piercer Bow (not the equipped creature) is the source of the triggered ability and the source of the damage. This means that a creature with protection from green may be targeted even if Heart-Piercer Bow is equipped to a green creature, but a creature with protection from artifacts may not.
Jul 28, 2023
If a creature is attacking a planeswalker, the controller of that planeswalker is the defending player. If a creature is attacking a battle, the protector of that battle is the defending player.
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