Thanks for giving this feedback! The lucky draw definitely can feel annoying sometimes. There were two aspects for including the card; firstly it's something that breaks up the gameplay which hopefully helps add some variety, and secondly it is another way to add to the challenge of managing the size of your deck. I think at the moment it's not the best implementation, because like you said the player doesn't have much choice in it - I'd be open to hearing any thoughts on ways to make it more engaging 😊
Maybe what you can do for the lucky draw is maybe move it to the shop where the player can pay a certain amount of gold to gamble on getting a card, and its either common, uncommon or rare and the more gold you pay, the better the rarity of the card. The lucky draw also has a 10% chance where it pays you back double the amount of money or let you choose between 3 cards of the rarity you paid for instead.
As for the card alter, you should move it to the shop too so all of the deck management is in one place. Technology, the card alter is a hybrid of the junk shop and the lucky draw since you trash up to 3 cards and get a random card back. Only thing I can think of is you pay gold to cut cards out and end the runs after 3 maps total since if they go on for 4+ acts, you still have to deal with deck bloat problems from forced card rewards, etc. and I think I would get sick of the game after 3 maps since forced card rewards and long runs don't mix well.
That's my 2 cents on the topic to move everything to the junk shop so you get all of the deck manager services in one shop and add more events like one that gives you a random relic, etc. As for the deck, showing 3 cards at a time and you pick one to resolve gives you some control over the order of encounters or events you want to do. Another game I play on mobile, Dawncaster, does that with a deck of cards and if you want to watch a video of it or something, its one way to do the map deck a bit.
I think maybe just reframing it could be better. Like, instead of "Yay, you get this good thing! (but secretly it is bad)" you could do "Oh no, a fairy added a card to your deck! (but secretly it may be fine)". Also adding the card altars means this game has *so much* card destruction, so leaving it as is is probably also fine since any cards you don't want you can toss at a shop or altar anyway and you're never gonna use up all the sacrifices anyhow.