Heart-Piercer Bow #221
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$0.14
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Card Details
Whenever equipped creature attacks, this Equipment deals 1 damage to target creature defending player controls.
Equip 
“Designed by an ancient artificer, the finest Mardu bows are carved from dragon bone and strung with the wind itself.”
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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