I like this. Most people try to teach card games by listing every rule, but it's much easier to play a simpler version then add in new rules.

I play the Chinese card game Zhao Peng You (Finding Friends, part of the Sheng Ji family of games https://en.wikipedia.org/wiki/Sheng_ji), which is a trick taking game with a trump suit that changes between games, a trump number that changes between games, and a team selection mechanic rather than fixed teams. It's insanely hard to learn everything at once, so we usually start new people with fixed teams and trumps just to get the feel of a team-based trick-taking game, before adding in the complications.

Every game is easier to learn when you start with simple rules and then add new ones as you go.

We teach people Liar's Dice. It's a very simple game, especially if you build it up like this. Everyone gets five Dice. You roll them and look at your own, and then take turns guessing how many of a given number are on the table. Guesses have to "go up" (either the number of dice stays the same and the number of pips goes up, or the number of dice goes up). Instead of guessing you can challenge the person before you. Whoever is wrong loses a die and game play repeats.

After a few rounds, dice showing a one are wild.

After a few more rounds, if anyone in a round bids 1's, then ones are not wild for that round.

After a few more rounds we start discussing the probabilities and strategies.

The challenge is not breaking the game fundamentally while you add rules.

We play Uno like this. Start with the basic (agreed upon house rules), then every time someone wins a hand they get to add or remove any rule they want, as long as it doesn't outright break the gameplay.