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Sure, it's cheap -- but it ramps your opponent's mana and gives them a body that can still attack and block

For most Modern, Legacy and Vintage decks, this is not a restriction, as the three mana permanents are already considered too expensive the for format, and it took less than two weeks for the Eternal formats metagame to be dominated by Lurrus' decks

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With careful examination, you should be able to spot obvious issues and hopefully the more subtle ones as well