Thank you for flagging this!!!!! I just found this out in the worst way possible after drafting two Lyev Skynights; this should absolutely be made clear in the overlay for the "Detain" keyword (screenshot attached showing the inaccurate description; also, please don't shame me attempting to five color). For folks drafting the format that are not already familiar with this term, the incomplete defintion is a major issue in judging the power level of cards. To me this is a very high priority fix as this was actually the first time I found that Arena made a clear mistake and made me lose trust in the platform (vs me making the mistake), and I've been playing since the beta. Happy to provide more info or otherwise help but this must be fixed to protect the integrity of MTG Arena. First post btw (again because of how big of an issue this is).

"Until your next turn" isn't in the detain keyword information and this makes a big difference to how it plays. Also on Windows.

I made a pick in the draft without understanding this ability.
Also, my opponent read and understood the text verbatim and made plays.
It messes up the game.
Same with Windows.