Lol I am so doing that!

 I am a kid DM in a party of veteran adult players with help from many veteran DMs and I would love to see the looks on their faces when they find out that the weird deck of cards they found was really magical!!!

Quote from Matthew588 >>

Could someone draw a card at random, decide they don't like that one, and put it back and draw again?

Quote from Yamissed >>

Can you pull a card and choose not to throw it so in the end you kind of get to choose the illusion but it takes a significantly longer time?

Of course you would get to choose if you were the one that made the deck and already knew what each card meant.

 That's not how it's meant to work. You throw some random card and see what you get.

*Insert Yu-Gi-Oh! Opening*

...can the illusions fight other illusions? 

For those asking if the illusion has sound, audible sound effects. This item has been around since 1st edition of AD&D and I played back then. This item has sounds. YES. You create an illusion that appears and sounds real. Otherwise who is going to believe a Red Dragon that is moving about and appears to be roaring but silent. Also more powerful illusions do have sound.  

If you were to use polymorph or be a Druid and were shapeshift into Medusa, would you turn people into stone? or would that not be how it works since you don’t actually have her power

can you make these cards my DM gave me them and i have used 49 and i heard there is below 60 of these

Had the party go on a quest to save a princess from an ancient tower in the dark evil forest which she could not leave. She told them to find the witch of the woods who enspelled the tower.

much later, witch questioned, ingredients and puzzles solved they made it to the top of the tower…… the witch told them to pick up the center keystone on the top of the tower and release the princess. 

Yep it was a deck of illusion card. The sentient illusion   was released after 500ish years. They got the gold but not the girl.

Quote from TheIonicAtom >>

This item is absolutely broken, with a level 5 being able to throw down an illusory red dragon or, out of battle, actually throw down the entire deck, you can actually scare away the DM's boss fight with absolutely no damage taken.

Buy it, folks.

 But their Illusions the boss won't take damage ether

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If I throw the card down on a tensors floating disk does that count as moving it? Technically this disc is moving and the card is not.

I 100% agree this item is completely broken and here is to the people wondering the price:

it can value between 8000 and 10,000 GP. just letting everyone know that this is not 100% accurate as for I got it of the internet but it seams pretty reasonable to me. defiantly will buy this and thanks for the heads up.

Most BBEG's are spell casters in some way so the spell Detect magic is a quick counter.

That is absolutely amazing  >< \___/ ><

Pretty much all intelligent creatures will have object permanence, but they are also aware that they live in a world where people wearing starry robes and funny hats can make real stuff appear out of nowhere.

Quote from Goodefella >>

I had the most fun introducing this to a low-level party that had a vague idea of what a Deck of Many Things was, drew a card from it, had an Adult Red Dragon dramatically appear before them in a cavern and spread flames all over the ceiling, and then asked them to ALL roll initiative. With dramatic boss music playing as well. XD

That's pure evil, but hilarious.

Quote from Captry105 >>

Most BBEG's are spell casters in some way so the spell Detect magic is a quick counter.

 They would have to question it first, which isn't logical. Any dm worth their salt would refrain from using detect magic until there was reasonable suspicion- like if they don't take damage.

Quote from JamesNovak >>

If you were to use polymorph or be a Druid and were shapeshift into Medusa, would you turn people into stone? or would that not be how it works since you don’t actually have her power

 Hello there! Your question seems to have gone unanswered for a couple years, though that might be because this is an odd place for the question to be. But the answer is that you can't Polymorph or Wild Shape into a medusa. A medusa is a monstrosity. Polymorph states that the "new form" you can choose can only be a "beast whose challenge rating is equal to or less than the target's [challenge rating or level]." Wild Shape, similarly, allows you to "magically assume the shape of a beast that you have seen before." The key word in both instances is "beast," which limits the creature type. Wild Shape additionally limits your choice pretty hard based upon CR, almost exclusively limiting you to CR 1 or lower. Moon druids can get some additional utility out of Wild Shape, being able to (at higher levels) shape into a few specific elementals and being able to reach beasts of up to CR 6, but unless a subclass feature specifies that you can become a monstrosity of CR 6, a medusa is off the table for Wild Shape.

However, if you were to use the 9th-level spell True Polymorph to become a medusa, the answer is that you would be able to use the medusa's petrifying gaze while you were in the form.

Not sure if someone has addressed this in the last 5 years, but it clearly says “pick a card at random.” Picking all of the available cards, even if you do it via a proverbial 52 card pickup, is the opposite of that.

ETA: you could pick all of the cards, but it would take as many turns as you have cards. And while there might be lower level campaigns where you could pull one of these out and force the bbeg to bail out, I would guess that most higher CR fiends, mages, liches,  dragons, elder evils, etc would have a presumptive knowledge of magical items at least on the level of PCs, if not exceeding them. They might need an arcana check, but that would probably be about it. And if they have truesight then it’s a moot point anyways.

one time we robbed a guy with a lich