Concept of a new card ability

[vernal remnant]

"Classified - While this card is in your hand or deck, it cannot be targeted by orders, passives and deployments effects, triggers or unit abilities. After being played or deployed, it loses this effect for the rest of the battle."

The idea is that you have a card in your hand or deck that cannot be affected by your opponent or yourself until it is played. Such cards serve as a kind of "ace in the hole" that can complement your deck or help you get out of a difficult situation.
Among its features, it's worth noting right away that cards with this ability cost exactly 2 credits (by analogy with covert units, which all cost 3) and they can be discarded when you have a full hand.

Here are a few examples themed around the Vietnam War, but feel free to imagine this mechanic in our beloved World War II as well.

[pale valley]

You already can't target cards in hand or deck

but also why make it lose the ability when it's... No longer in the hand or deck?

I think SADM is poorly designed because it's so RNG reliant

[languid lake]

I honestly think that it wond discard itself because of classified

[pale valley]

But that's not like a target

But also if that's the case why have both classified and discard itself on it lol

[hexed wagon]

I do not think it needs to be limited to two credits. After all the enemy could detect it with intel and it gains little benefit from being hidden.

[spare goblet]

@vernal remnant better way to reword classified

Classified - Card cannot be affected by enemy orders or deployment effects and cannot be converted or discarded while in hand or deck. Loses Classified after the card is played

Essentially Intel doesn't reveal it, discarded, enemy shuffle cards can't do jack oh and it can't be converted