2021-04-16 : Cards are exiled face up unless an effect states otherwise.

2021-04-16 : Exiled cards with study counters on them retain their study counters even if Kianne or Imbraham leave the battlefield.

2021-04-16 : The second abilities of both Kianne and Imbraham look at all cards you own in exile with study counters, even if they were exiled by a different permanent, such as another Kianne or Imbraham.

2021-04-16 : You may choose 0 as the value of X as you activate Imbraham’s last ability. If you do, you will not exile any cards from your library. However, you may still put a card previously exiled with a study counter on it into your hand.