Treasure Keeper failed to fetch card [Devs Aware]

buscemi

Hello! Treasure Keeper does ONE THING. ONE. It fetches the first card in my deck with cost 5 or lower from my library when it dies, and gives it full mana. ONE THING.

My library contains Aerial Modification. It costs 5 or lower. It is a card. It is in my library.

The battle log says 'Treasure Keeper was triggered', so I assume it fetched the card. But it did not give it full mana. None of the cards in my hand had any mana in them.

ONE THING.

Have you ever heard of playtesting?

*Edited mentioned card to reflect the correct name
-Brigby