A neat thing that I totally won't figure out how to make the most stupidly OP item

Maddy saw some nerd do a card trick on a train, and now she wants a rigged deck of cards.

It's a standard deck of 52, with one Joker and another card marked "Oblivion" featuring a demonic face. The backs of the cards are identical in their black and grey-patterned appearance. The faces of the cards are printed with a special ink, allowing any card she is touching to change into any other card in the deck with a single thought.

What's the damage?

What you want is a "deck of many things"

No other special qualities? Just the cards, no enchants other than them being "rigged"?

Correct, Shin.

For your beautiful ass, 50 GP. Assuming of course they aren't made from steel or can explode or anything.

I will admit that I was sorely tempted to give them a razor-sharp edge or some other bullshit enchantments, but that'd be overkill at that point.

Take my fitty golds, sir!

Done deal.

Maddy gets a shiny new deck of rigged cards as above and loses fifty shinies.

Transaction completed on 4.0. - Ray