Your player level is determined based on your card collection. At the top right of the screen, you can see what your base health currently is.
Your base health depends on your level, and the higher your level is, the higher the base health will be.
The XP bar displayed below your player name indicates how close or far away you are from your next level up.
Collecting more cards and upgrading them will increase your level. The rarer the card is, the more XP you will gain. For example, obtaining or upgrading a Common card will earn fewer experience points than obtaining or upgrading a Rare card.
Please note that not every level increases your base health.
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