This is a reminder post for myself:
There will be 400,000 cards for commons.
There will be 100,000 cards for rares.
There will be 40,000 cards for epics.
There will be 10,000 cards for legendaries.
Keep in mind that the following approximate supply limits are expected for Beta cards:
commons: 135k
rares: 55k
epics: 12k
legendaries: 3.6k