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When a Goblin deck has enough creatures in play, Brightstone Ritual can add lots of red mana at once to cast a single massive spell, like City on Fire, or several cheaper ones

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Rolling Earthquake Speaking of sweepers, Red also has a great one in Portal:Three Kingdoms

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There is also Wifi play, so people can download duel opponents, banned lists, free cards, duel puzzles, and buy cards using wifi points, won by playing other players online