I’ve been collecting data for Fatpacks and 3 packs and here is the information I’ve gathered
For Fat Packs:
Out of 23 Fat Packs, here are the percent chances to draw rarities
Common - 33.69% chance per card, 1:3 ratio
Uncommon - 47.82% chance per card, 1:2.09 ratio
Rare - 15.21% chance per card, 1:6.5 ratio
Mythic - 3.26% chance per card, 1:30.6 ratio
Average Fatpack
Commons: 6.73
Uncommons: 9.56
Rares: 3.04
Mythics: 0.65
Now for 3 packs (bought with runes)
Out of 529 packs, here are the percentages to draw each rarity
Common: 82.04% chance per card
Uncommon: 15.75% chance per card, 1:6.35 ratio
Rare: 1.95% chance per card, about 1:50 ratio
Mythic: 0.25% chance per card, about 1:400
Average 3 pack
Commons: 2.46
Uncommons: 0.47
Rares: 0.05
Mythics: 0.0075
Since these numbers are so low, here are how many packs you would have to buy in order to get one (on average)
Uncommon: 2 packs
Rare: 16.6 packs
Mythic: 133.3 packs
Shout out to everyone who provided information to make these statistics more accurate
NOW FOR SOME STATISTICAL FUN!!!
There is a 55.21% chance your 3 pack has all Commons
There is a 0.57% chance your 3 pack will not have any Commons
1 out of every 153 3 packs will have 3 Uncommons
1 out of every 125,000 3 packs will have 3 Rares
1 out of every 64,000,000 3 packs will have 3 Mythics