trying to use a variable inside a static content tag

Greetings.  I am writing a card game and I can load an image when I give a fixed value such as:

<img src="{% static "app/images/ah.png" alt="ah" style="width:69px;height:106px;">

but I would actually like part o fthis to be determined by a tag (there is a for loop setting values) but when I write:

<img src="{% static "app/images/{{ card }}.png" %}"" alt="{{ card }}" style="width:69px;height:106px;">

however when this is rendered into HTML the tag {{ card }} ha sbeen URL-escaped:

<img src"=/static/%7B%7B%20card%20%7D%7D"" alt="KC.png" style="width:69px;height:106px;">

How can I render a static image based on the contents of a tag?

Cheers,

Lyman Hurd

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