Prayers to Nuffle - problematic for league play?

I heard in Jimmy Fantastics videos and read here that Prayers to Nuffle are kinda problematic.

In your experience, does this apply mostly to tournaments, where that additional random factor can be a pain for one player?

Or would you consider them problematic in general and worth banning?

We're currently discussing banning them for our upcoming league, which is kinda casual, so we will probably allow it and test them out.

I know that the're random, but when I took 3 of them in a test game, all I got was 2 SPP ones and trapdoors haha. However I see that if the stars align, there are some really really great ones on them.

What's your experience with them ao far?