People might know already, but iron patriots cost reduction applies if you play the card

Just had this interaction and it might be expected / obvious, but I had a good hand and iron patriot spawned Wiccan, which I played on curve due to castle blackhand - so the card he generated was in play, at 4 cost.

The next turn I played Frigga, and the copy she created in hand was 0 cost - for some reason I assumed it would be like any other copied card that retains power increases etc when copied, didn’t think the negative cost from patriot would retrospectively apply to a card already on the board