You should make each new set that is released contain a much higher percentage of keyword cards.
Some reasons for this:
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Gives each set an even more obvious cohesive theme.
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More options for players which playing a ‘play X cards with Keyword’ style objective.
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You’re more likely to accidentally make some good cards with the Keyword (perish the thought!
). -
Less vanilla 2/2 6 mana commons that nobody will play.
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Less work for you thinking of clever mechanics to print on commons that nobody will use.