vapid briar
I feel like a cool mode to have would be a custom mode, you choose the map, the enemy deck, and your own deck, you can activate or deactivate the tower zapping the statues after a certain amount of time or even just get rid of the tower, you chose what both sides start with (miners, diamonds, gold, etc), you can add or subtract the material nodes from either side and the middle if you want to make your own gold-rush, you can activate if you want to face 2 different AI and can manipulate how they act like in the campaign where one AI will stay to guard the statue while the other attacks, you can give the AI the ability to possess units like in Stick war Legacy tournaments or the Stick War Saga campaign, you can change whether or not one side has a statue or not, make your own ambush with custom time (you can make the time anywhere between 5 minutes to endless and how the ambush ramps up overtime), you can add stuff like instant build, you can change the amount of upgrades both sides can have, you can play with friends if you wish, you can change the colors of both teams (any color that is seen in game like yellow, blue, black, red, etc), and so you can't just get a bunch of free rewards it won't count towards achievements and quests.
New Idea 1: is to make the generals free in this mode exclusively, that way everyone can test certain builds that may require certain generals to make them more effective.
New Idea 2: you can make challenges like from Legacy where certain units are not usable (I know you could just NOT use certain units but it would make it interesting to try and keep only the miners that you start with alive while not able to spawn more)
loud sentinel
wild fable
umbral thorn
proud vault
golden violet
sinful jolt
keen cave
late sand
wanton tulip