MArcomage

To link an effect not to playing but the discarding of a card is and probably wil stay not possible, I think.

That's true. You are only allowed to attach card effects to the played card.

Why is that ? :(

Our card engine was designed like that. You cannot attach card effects to a card even if it's discarded with standard discard action. If we would want to support such cards we would have to redesign the whole engine.