PICK THREE.
REGRET ALL OF THEM.

ONE DECK, THREE CARDS. Seventy-eight cards, the full 1910 deck, shuffled before you see the fan and shuffled again every time you ask for a new spread. The shuffle is the standard one card players would recognize if card players read source code: start at the bottom, swap each card with one drawn at random from the cards above it, and every one of the orderings a deck of 78 can take ends up equally likely. The three you tap come off the top of that shuffled pile in order. Which card in the fan you tap changes nothing. The shuffle already decided, you just agreed to it.

THE ODDS ARE NOT A SECRET. Each card lands reversed three times in ten, rolled separately for each card, so a spread with nothing reversed turns up about one time in three and a spread with all three reversed about one time in 37. There are 456,456 ways to draw three cards in order from 78, and eight ways to turn them, so your exact spread is one of 3,651,648. The chance at least one of your three is a Major Arcana card is roughly two in three. All three Major is about one spread in 49. Nobody is dealing you the Tower on purpose. You just keep showing up for it.

THE SHUFFLE HAPPENS ON YOUR DEVICE. Every random number comes from your browser's cryptographic generator, the same source it uses to make the keys that keep your bank login private, seeded by your operating system from hardware noise. It is the strongest randomness a web page can get, and it is not the ordinary Math.random that games and screensavers use, which an attacker who watches enough of it can predict. We take 32 bits at a time and throw away any draw that would tilt the result toward the low cards, then draw again, so every card is exactly as likely as every other. Nothing is weighted, nothing is seeded by your question, and nothing is drawn on our side. The server only ever sees three card names and which way up they are.

THE DECK IS THE DECK. The cards are Pamela Colman Smith's 1910 drawings, public domain. The meanings under each card are the first three of the traditional upright and reversed meanings that have shipped with that deck since it was printed. Roastie is handed the whole list, and the deck's own 1910 companion text for each card, nothing newer.

THEN THE BEAN READS IT. Roastie gets the three cards, their orientation, their meanings and your question, and works from those and nothing else. He may leave things out. He may not invent a card, flip one the deck didn't flip, or read a card you didn't draw. The draw is random. The contempt is on purpose.