This pay2win game fails as hard as the Xbone.
Seriously, change the energy system and at least give people 1 dp a day for logging in, otherwise this game will become a graveyard soon.
Another hint that this is money grubbing pay to win game: You can't use your cards in different decks. Want to use mirror force in 2 decks? Buy more copies of it.......Fail!
Actually you can rebuild the Decks. Unfortunately the game is designed the way that you only have this 1 instance of the card. It's not meant to be "pay 2 win" because actually you can use that card in another Deck. You just need to pick it out.
Hard badge general tips: Upgrade warrior attack first, then health so he can solo golems. Then upgrade mages and then spells. Just build mage towers on all missions on all spots. It is easily doable. You have to also attack mammoths to slow them!
There are more ways to receive Coins.
We have a gifting system, you have 5 free Duels each day which will be rewarded with 5000 coins.
You can also buy a Booster Pack for Card Pieces which are easily collected when Dueling your friendlist or competing in the Duel Arena.
Cards that you do not need or do not want can be sold for coins. This game is not supposed to be played through within a week.
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Actually you can rebuild the Decks. Unfortunately the game is designed the way that you only have this 1 instance of the card. It's not meant to be "pay 2 win" because actually you can use that card in another Deck. You just need to pick it out.