Ex Hidden Legends
Ex Hidden Legends has basically the same card rarities as Ex Team Magma vs Team Aqua. The only difference is that 3 of the 9 Pokémon-ex (Regirock, Regice and Registeel) have a cracked-ice holo pattern, meaning they were printed on a separate sheet from the other Pokémon-ex. In a somewhat larger sample than for the earlier Ex Series sets (8 boxes for the holos, rares and Pokémon-ex and 7 for the reverses), the cracked-ice holofoil Pokémon-ex have a consistent rarity of 1 per box, the other (cosmos holofoil) Pokémon-ex a consistent rarity of 2 per box. The rarity table looks as follows:
EXa is the sheet for the cosmos holofoil Pokémon-ex, EXb that for the cracked-ice holofoil Pokémon-ex, and O is the box topper (Groudon).
The raw data for the holos, rares and Pokémon-ex is given below, the dashed lines indicating where the transition from H8 to H7, R11 to R10, EXa-19 to EXa-18 and EXb-37 to EXb-36 would occur:
The sample isn’t large enough to say anything for sure, but for the holos and rares, I feel it is large enough to say that the H8 and R11 cards are most likely cards in the upper parts of these tables.
As usual for post-WotC era sets, I didn’t look at the commons and uncommons.
The analysis of the reverses is of interest to see if the holofoil sheets being used are still 110 cards sheets or if a transition to 121 card sheets has occurred. In the table below, I compared the observed data with the expected result if either a 110 or a 121 card sheet was used, the “extra” spaces being filled in one rarity at a time (in this case, reverse uncommons first):
The 10x11 (110 card) sheet fits betters, though it is quite possible the extra spaces were filled in with a mixture of reverse uncommons and reverse commons.
For this reason, am sticking with 110 card sheets for modelling all holofoil cards. Looking into the future, I have analyzed some data for Ex Delta Species and Ex Power Keepers, and in both cases I am also leaning towards 110 card sheets being the best fit. So probably, I am going to model all Ex Series sets this way.