This card's effects can only be applied/resolved while it has Xyz Material. This card can attack your opponent directly. Your opponent cannot target "Harpie" monsters you control for an attack or card effect. During each of your End Phases: Detach 1 Xyz Material from this card.

Yea so, can someone help me on this? Harpies pet Dragon CANNOT be targeted for an attack right? It dosent say OTHER Harpies cannnot be targeted, it says Harpie cards PERIOD.

I had it on the field tonight, and it didn't work alone. I think it may need (Atleast 1 more Harpie monster to exist on the field before this effect will work) Unless you did and it still didn't work?

Sounds as if Harpie's Pet/Pet Mirage Dragon isn't counted as a Harpie card.

harpie pet dont let u opponent to tarjet harpie cards for attack or effects expect himself