Tracking of cards in hidden zones

When I get to see an opponent's hand, I (usually) get a popup showing me the content of their hand that sticks around. I'd like to be able to remove cards from that popup as they get removed from the hand, to have an easier time keeping track of what I know is left there.

When it's effects like "look at opponent's hand, deck, graveyard and exile all X", I don't get a popup and have to keep track with a screenshot.

Ideally, I'd like to also be able to just have a permanent "opponent's hand" tracker. It could be semi-manual, with me putting cards there by name, so that not everything that gets revealed before going to hand needs to be tracked manually (for instance; cards that were revealed on top of the deck before being drawn, cards added with "look, show and add", cards returned from graveyard to hand etc).

magefree / mage

Tracking of cards in hidden zones #12785