I used this line in a conversation script but there is a problem recognising the object (undefined token "oCards").
oCards.Visible = true;
In global scripts and conversations, you can only refer to room objects by an index in the global objects array. e.g.
object[0].Visible = true;
This index listed in the room editor as the ID of the object. That was just an example. I don't know what the ID of oCards is. You'll have to use the room editor and look that up yourself.
Thank you man!