card example:

i don't think this is a good example as it is. how about:

low level items are suits, high level items are numbers. therefore, 4 of the same card, e.g. 4 deuces, has the exact same odds as 4 of a higher number, eg. aces, and the game treats it as such, no matter how much you would prefer aces instead of deuces. however, low level items are like getting 4 of the same suit in a row, which, as any poker player will know, is only like a 1 in 7 chance of happening.

also, the card example is bad in that every card dealt changes the odds of each succeeding card. if you are dealt a heart, the next card has a far lower chance of being another heart, and a higher chance of being a spade, club or diamond.

how about this: imagine a deck where there is only one ace, 2 kings, 4 queens, 16 jacks, 256 10's, etc. all the way down to deuces, with each lower number having the square of the previous higher number. and then, you draw one card each time, with the deck being reshuffled after every draw. in this example, you can easily see why you can get 6 kite shields in a row, but not see a sacred armor, ever.