Hey, can i get a PC on this item pls?

Vampiric Storm Bow of Tenguslaying [Gold]

Piercing Dam: 15-28 (req 12 marksmanship)
Life Stealing: 3
Health regeneration: -1
DMG +20% (vs Tengu)

I've no ideas about its value because of that bloody Tengu upgrade - any help would be greatly appreciated, ta