I can force a situation where you need to use a Stone with under half that mana
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Aragorn and Arwen, Wed is fairly effective in the right build, either in a Limited or Commander deck, since its colors and effects are flexible and don't rely on Tales of Middle-earth effects to truly shine
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With the exception of Drytron, each of the decks mentioned above consists of monsters of varying attributes, making Gozen Match a similarly effective counter to these decks