I'm sorry to say that this is not a great design.
The whole point of the Rune system is to restrict cards from being played with other cards and this completely flies in the face of that type of design. If it simply gave one extra Rune slot, this would be a lot more tolerable, then removing Rune restrictions from every card just means that surely something is going to be broken, even if restricts you to running Highlander.
Please do not let this dissuade you from continuing to make more cards though. The whole thing is a learning process.
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