Levelling up cards - what does it do?

I've been playing the digital game for a couple of months now but recently got myself a couple of starter decks to play locally.
What I can't figure out is what "levelling up" cards actually does - I get messages now saying a card has levelled up and I get some bonus coins, is that it? Or is there anything more?
Extra coins are nice, just wanting to know if there are any further surprises/bonuses to be had?

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