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Someone who's using HP in their deck apparently plans on using it themselves at some point. Its inclusion in a deck puts it at risk. While I've never heard stories about someone actually pulling off using an opponent's HP, it was an avoidable situation.
When G an H first came out in a sealed tourney, I played taking Egypt's wealth to steal my opponent's haman's plot and I had love o money in my hand! He didn't attack me the rest o the game!