I am certain that this will not be any news for seasoned #steemmonsters players. Yet, it is a brand new discovery to me - a noob player :)
Listen very carefully ...
You can convert your alpha cards to their beta version
Be sure to have your alpha card displayed. Then:
- check it
- Convert to beta button becomes active
- click on it and confirm the action

Ta Da ...
Congratulations. You now have a beta card and can combine it with other beta cards of the same monster to level them up.
Like this ...
And you get ...
Nice :)
Happy converting :)