Aliasing cards → card
Link to alias

Reason:

not sure whether doing "plural" or "singular" is correct, but "card" has more posts.

relevant: playing_card is the tag for game cards. The plural version of that was aliased to the singular version, so the alias sounds good.

Card is better since you can have only one card in a picture. So, it would be aliasing the plural to the singular, as you suggest.

Plus one.
Plurals are usually aliased away, and there's some other related tags that imply multiple cards. Such as card_game.

Approved