Most commonly (but not exclusively) seen in Touhou-related images. They first appeared there in the sixth game, and have been a mainstay of the series ever since. Spell cards allow the casting of powerful, intricate danmaku patterns or the usage of special abilities.
This tag is only used to denote the presence of an actual, physical spell card. Images that portray a recognizable spell card's spell in action or its effects should be tagged with spell. A few of these are shown frequently enough that they have dedicated tags on Danbooru, however (Four of a Kind, for example), so consider using those tags as well when appropriate.
