I have never seen this card usefully used in tournaments. If you take a black arrow for comparison, instead of only tapping the item for -1 (to the attacker) you have to tap the bearer and must make a corruption check for +1 to the defenders. Additionally you get 2 corruption points instead of one but the body of the attacker is not lowered.Playable on an Elf at a Haven[ ]; tap the Elf. When facing an attack, bearer may tap to give +1 prowess to all characters in his company against the attack. Bearer makes a corruption check. [2 corruption points]
My submission is to remove the corruption points from the card as an erratum to make that card a bit more useful.