I got some suggestions, so maybe you could think about them and maybe add them to the next version.. well here they are..
New Decks
-Ice
-Earth
Weather (would be random after a period of time)
-Snow
-Normal
-Rain
-Fog
-Heatwave
-ect.
Weathers could give units an advantage and disadvantage. For example, fire units will have more hp and attack damage on a heatwave and water walks slower and hp gets lower and lower attack damage. Or water and storms have more hp and damage if it rains and fire goes slower and has less hp and attack damage.
Cards
-Bug: Some cards after being used, are still in your inventory.
-Summons are able to level up.
Map
-Maybe enlarging the map making units have a further path to reach summoners (can fix from rushes and gives decks with range, like fire, water, and storms be better).
Challange
-First team to get certain amount of points wins. Voting is enabled when game starts.
-Hostile units are scattered around the map for a bigger challange. (randomly spawn but NOT too many)
Teams
-Able to change team if player leaves to balance it out. Voting will be required.
-Instead of left to right, it should also be a big war with left to right, and top to bottem. (leader of the team picks were summoned units go and can be changed whenever)
Thats really all, and try maybe balancing out decks. I hope I gave you good ideas
