Uncollectible

Uncollectible cards are cards which although available in-game cannot be collected by players. While these cards are often playable and obtainable by players in the course of a match, they cannot be added to players' collections or permanently acquired.

Uncollectible cards are distinguished from collectible cards; boss cards that are not available in regular play; and unavailable cards such as debug cards.

As of One Night in Karazhan, there are 189 uncollectible cards in the game, 155 of which are included in Standard format. The game also features 15 Hero Powers which can be considered uncollectible, due to being available only through the effects of other cards.

Spells
Note that choice cards are not included in the following list, but are listed separately below.

Choice cards
Choice cards are special uncollectible cards that appear only briefly when choosing between possible effects. Choice cards only exist during the selection process and cannot be placed in the hand or deck. They are mostly produced by Choose One effects.

For a full list, see Choice card.

Hero Powers
While Hero Powers are not normally considered cards, the following Hero Powers can be considered uncollectible. Each class' standard Hero Power can be freely chosen through class selection, after which it is available from the start of the match, and thus can be considered collectible. In contrast, the Hero Powers listed below are uncollectible in that they cannot be used unless first gained through the effects of other cards.