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Daily spins!
Every 24 hours you get a daily spin, you get chance to win a small amount of gems (like 10 or something). Win free attacks or short shields that you get to choose when to activate. Maybe even win small amounts of gold, elixer, or dark elixer. Maybe they could add a damage multiplier that you could win on a spin (not a big one that would be op).
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This will probably never be added due to the fact you get free stuff like you mentioned. The gems you already get from objects on the ground, free shields are kind of unfair, and overall this idea is very smart. I see you have a creative idea here but no it will probably not be helpful to the game.
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You already get around 3 obstacles everyday, not to mention the potential gem boxes. I think that's enough. Also I don't think SC should reward us this much for just going in the game.