Mass Polymorph is a 7 Mana Cost Epic Mage Spell card from the Fractured in Alterac Valley set.
Mass Polymorph (Card)
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Mass polymorph with good stats for cost : r/hearthstonecirclejerk
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Mass Polymorph (Card)
Mass Polymorph, Eternal Card Game Wiki
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Balinda Mage #445 Legend - ForDaKingHS (Score: 16-6)