What will it be if we can fuse two soldier?
That will be cool if the game provide special mission at special time to win a fusion card.
Then we can fuse Wizard with Dragon, you have dragon rider, with more damage.
or a card that says +200 damage for a wizard, so if u include a wizard in the battle, u can use the card. but if u dont have wizard on the battle, u can still use the card in next war, but only once.

Or Goblin with balloon? so Goblin will fall down to the resource. Or witch with Balloon.