OCG Help, Complicated-ish effect

[Oriannis]

I am having difficulty with some OCG for an effect i want to use (No surprise there). I want an effect that can attach a card to an opponents XYZ Monster and activate an effect once it has done so.

 

One other thing. is such an effect viable? if not ill toss the idea.

[Atypical-Abbie]

"activate an effect", do you mean an effect of that monster? I think that giving us an example of how you would word the card, even if badly, would help.

[Radiant F.U.R.Y.™]

Also, when you say attach a card to an opponent's Xyz, do you mean it attaches itself, or another card to the Xyz?