We played a ton of Sleeping Queens and it was the perennial pre-bedtime favorite for both girls (7.5 and 5 next month), to the point that my oldest was able to trade in all 5 cards more than once. We were so impressed we instituted the house rule that if you can make a number sentence out of all 5 cards you get to go again (we also allow subtraction, multiplication, and division sentences).
The latest craze is Unstable Unicorns, which someone else here had mentioned. I was worried it’d be too advanced for both of them, and while my almost 5 year old doesn’t grasp the greater strategies, she is able to read the cards and race for the win. The 7.5 year old is downright devious and any concerns about it being too advanced were misplaced. She’s ruthless, cunning, and conniving at the game and more often than not beats my wife and I!
Plus, they both love the unicorns.