I hope i cleaned this up enough for others to understand and use.
Activity Rotate Card
Lovelace card that shows the nested card for whatever is running, rotates when more than one thing is on, and falls back to an idle card when nothing matches.
Each row is “when this entity is in these states, show this card.” Any Home Assistant entity and any Lovelace card work — mushroom, picture-glance, a custom laundry / pool / mower card, markdown, entities, and so on.
Swipe left or right (or tap the dots) to skip ahead without waiting for the timer.

