I think I know a way this card can be kind of fair still a little op but maybe reasonable. "If a Gemini monster with it's effect active is destroyed then destroy (x) amount of opp. monsters. I say 2 but 3 mons still fine with me.
How the hell is this card even remotely comparable to Mirror Force? Are you guys serious? It needs 2 conditions to be activated! 1 a gemini monster with the effect (which takes resources to pull of), 2 it has to be destroyed by battle. How in the hell is it even close to Mirror Force, seriously?