theres so many variables for a potential ultra-rare hit, in the rare slot of a pack, varying levels of rarity between those ultra/secret rares, whether they were opened from booster boxes, etbs, blisters, single packs, print-run, are rarity levels different for different cards of the same rarity, etc. basically, just buy singles lol Also not a statistician by training per se, but I made a couple plots of the TCGPlayer data that include uncertainty on the pull rates: The error bars are 70% (dark grey) + 90% (light grey) confidence intervals. Two points with overlapping error bars should be taken as statistically indistinguishable in value. All available data is consistent with the null hypothesis of no particular card within a rarity tier being harder to pull than another. In fact, there is no significant difference between Alt Art V and Full Art V pull rates, once you account for there being more non-Alt, Full Arts in the set, i.e

For starters, Pull from Tomorrows discard triggers Archfiend of Ifnir
Black gift card sleeves give a sharp, modern edge for certain brands
However, when Bakura sincerely apologizes for being manipulated, Mani appears, possessed by the thoughts of the Millennium Ring, while momentarily hesitating