Really? check your figures again, 0+5+30+35=70
So as part of the above responses. I chose to purchase 6 big boxes in a row or Arther revolt. (Really I was trying to obtain Gonti lol )
I only bothered to track rares and mythics and my overall new cards.
BB1
Mythics 0
Rares 2
BB2
Mythics 0
Rares 1
BB3
Mythics 0
Rares 3
BB4
Mythics 0
Rares 3
BB5
Mythics 0
Rares 2
BB6
Mythics 1 (a dupe gearhulk)
Rares 3
Started with 900 of 1040 cards
Finished with 908 of 1040 cards
Yes I was swearing by the end.
There definitely seems to have been a significant downward change to mythic and rare drop rates since the last update.
I picked up one other mythic from a vehicle fat pack which means I have received (not even including daily packs and event packs)
3 Mythics in 715 cards.
That is a drop rate of 1 in 238.3 cards