I played Athletic Studies turn 1, discovered Imprisoned Vilefiend, which was reduced to 1 mana. I used the coin, played Imprisoned Vilefiend that same turn for 1 mana, but the mana discount remained on my Restless Mummy. I later on turn 6 played it alongside another 3-cost minion.
I received a double discount-potentially because I played a dormant minion that was discovered from athletic studies? Anyways, shouldn’t have happened, even though it was in my benefit.