I think we can come up with the number of total cards made by dividing 1500 into the total number of packs.
So far we have 5 Titles and there are probably 10 or so. So that means around 7 made per card. Just a guess.
from the odds on the pack, there are 250 cards of art change and 250 cards of character change
so far we've seen about 3 of each type, but likely there's a couple more out there, meaning about 50 of each variety.
If more show up, just keep dividing 250 down.