Hmm.
Fancy Hat
$5 - Action
Choose one: +$1 for each card on your Fancy Hat mat, or remove a card from your Fancy Hat mat and play it immediately.
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At the start of Clean-up, you may select an Action card you have in play. When you discard that card from play, you may instead place it on your Fancy Hat mat.
I started by trying to make something where copies of cards on the mat gave $1 when played (because they're now wearing a Fancy Hat they're worth more), but couldn't think of a good way to keep track of that when FH isn't in play. So somehow it morphed into this.