Combining your cards is leveling-up. When your card gets to the next level by combining cards (that would be 5 BCX for the Goblin Shaman as seen in the "for sale" category, but for other monsters it could be less), the card gains a point in one of the battle-relevant categories (health, speed, shield, attack or another skill).
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Thanks a lot for this information
You're welcome. the actual amount of BCX per monster is found in the stats category.
And no combined cards get lost, even if you don't have the actual numbers of cards to level up completely. 4 out of 5 for a level 1 monster will show as 4 BCX and the card gets a green experience bar, until the needed fifth card is added (combined with the 4 bcx card).