Good
At first I was iffy about this. I wasn't sure what to make about putting cards in, but after a battle or two I got it and liked it.
The battles themselves were fun, yet slightly annoying. Every time a new unit is spawned I had to tell it to advance, (which I figured would've been done automatically) but this also tells my Hero to move forward who I might have sitting back regenerating health. The other problem I had was that when I ordered my hero to move back a bit, it was always delayed or I had to click multiple times. Same goes for calling the meteor thing. Never did I click once and the order went through.
My only other gripe is that English is obviously not your primary language, so I suggest getting someone to go over your game and correct the grammar errors.
Other that these few issues, I enjoyed the game and look forward to Epic War 4 :)