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The card "Power Overwhelming" is most likely a reference to StarCraft, where the phrase appears both as Protoss Archon dialogue and a cheat code to activate god mode in the game.
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Some of the songs played during the matchmaking process come from Warcraft 2: Tides of Darkness.
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The card "Mana Wyrm" appears to have taken its art either from World of Warcraft Burning Crusade's Cinematic trailer, or was directly inspired by it.
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The card description for Fel Reaver, "So reaver. Much fel. Wow." is a reference to the Doge meme.
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The Flying Machine card says "They came from behind" when killed, a reference to the same line said by Gold Five "Pops" in Star Wars Episode IV: A New Hope and Warcraft 3, where the flying machine also says this line.
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When a Cobalt Guardian is killed, it will say "ERROR 37". This is the error code that players received when attempting to play Diablo III during its initial launch.
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If Wilfred Fizzlebang is played while Lord Jaraxxus is on the battlefield, the two will have a special interaction, referencing their interactions in World of Warcraft.
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