Can you help invent a Card Game which is 50% skill and 50% luck, which does not have broken/over-powered cards?

The game should be similar to existing TCGs, but not a direct rip-off of anything.

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I'm thinking something along the lines of what I already had, but I should add a "Forfeit" value to permanents, which allows them to be sacrificed to prevent permanent damage to your life total.
Can you help invent a Card Game which is 50% skill and 50% luck, which does not have broken/over-powered cards?
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