Today, six cards, but only three piles.
So how do these work exactly? The top cards are paired with the bottom ones. Each pile has 5 copies of the first (cheaper) card, then 5 copies of the second (more expensive) card. You can only buy/gain the card on top; if you want the other card, you have to dig it out. There are special randomizers for these piles, that list both cards and have art showing both things. You will see those when the set comes out; the six actual cards will have to do for today. And uh some things in the game care about stats for a pile, and well they go by the randomizer, which usually matches the top card. Young Witch can have Gladiator/Fortune as its bane (and then both cards will do the trick), Training lets you put your +$1 token on the Catapult/Rocks pile (and then both cards give +$1), and so on.
Gladiator has a cute interaction with the player to your left. If you manage to show a card they don't have, you get +$1, hooray, but you also eat a Gladiator from the pile. That way you are likely to eventually uncover Fortune. Which doubles your money, yeeha. And may come with some Golds; a reward for the players with Gladiators. If you were wondering how much doubling your money was worth, well, about $16, but you don't need it all in advance. And it's not cumulative because even at ~$16 that was too much. It can help pay for itself, I will just point out that part.
Settlers lets you get back a Copper; try not to draw it right after shuffling. And Bustling Village gets back a Settlers which gets back a Copper. And it gives you +3 Actions; that's just how Bustling it is.
At long last, we have the Dominion Catapult. Well it's been a great run guys. And it doesn't even let you throw something at the board. Catapult hurts the other players based on what you throw I mean trash; if you trash a Treasure they discard, if you trash a card for $3+ they get Cursed, and if a card has both attributes they both discard and get a Curse, yeeha. It's like a rodeo in here. As it happens Rocks is a Treasure costing $4, and does something useful when gained or trashed; it's just the perfect thing to Catapult. And it's called Rocks! I couldn't help myself.