Skewb technically only needs one alg to solve (Sarah's beginners). Even then, all the "algs" in Intermediate and Advanced are just combinations of sledgehammers, hedgeslammers and rotations, though I doubt you would want to learn advanced if it is just for fun. And get the Moyu (though some people will say that Shengshou is better, I disagree)
And the Crazy Yileng is not the Fisher Cube. That being said though, I can't seem to find any Fisher cubes besides mefferts. And anyway, the Crazy Yileng is very similar so it is probably just as fun. (I don't have either of them so this is just my opinion)