Runic Pyramid and Establishment power

[Camulorix]

Not sure if that's a bug or not but the descriptions are really sneaky:
Runic pyramid: "At the end of your turn, you no longer discard your hand."
Establishment: "Whenever a card is Retained, lower its cost by 1."

My first thought was that works really well together because I keep the cards in my hand. But because they are not discarded instead of retained, there is no synergy and the cost stays the same. :/

Maybe this should be made a bit clearer or it's meant for people to fall into this trap. Or it's a bug 🤷‍♂️

[PPPPPPPP270]

I thought of the same thing and probably thought the card needed to have the retain tag to work with enlightenment.