Spells definitely come in handy, a couple ideas I'd like to see, would be a flame spell that saturates whatever within the ring with constant burning flame for the duration of the spell just like rage spell or healing spell. Maybe even a pause spell that freezes the game clock but continues to allow you to play.Maybe even a trap spell that detonates all hidden traps that are affected by the area. The only reason I'd call these dark spells is because I would charge dark elixer instead of regular elixer if I made them
some interesting ideas but I doubt the time spell would be implemented just because we've asked over and over again to increase attack time by at least 30 seconds and they've yet to do so. Supercell is effective in wasting time making dumb features in the game for lazy people such as 'upgrading multiple wall pieces' will essentially become useless once the player starts trying to do those higher level walls haha. I like the fire spell idea and I could see it in the game but I think the trap idea wouldn't go over well.