How many wild cards are there?

If there is only 1 wild card there are only 13 ways to make 5 of a kind.

And there are 40 natural straight flushes.

And there are 11 straight flushes in each suit of the form (n,n+1, n+2,
n+3, Joker), 10 of the form (n,n+1, n+2 Joker, n+4), 10 of the form (n,n+1, n+3 Joker, n+4)
and 10 of the form (n,n+2, n+3 Joker, n+4). So that's 41 in each suit or 164 total.

So in this case a straight flush should lose to 5 of kind as it is a less common hand.