UI for "stolen" units / upgrades

[AMMayberry1]

It would be useful to have some kind of way to show when a card on the field is actually owned by the other player but has been stolen with an effect like e.g. Change of Heart. Could be something like a glow on the card.

Note that for units it's kind of a simple case, for upgrades it can get thorny since an upgrades can be attached to a unit belonging to either player and also can be stolen i.e. change controller (e.g. they can stolen with Evidence of the Crime).