Sure, its a deflating game-ender, but the uses of it are narrow enough (only in five-color decks, for one) that it might be safe out in the wild
When it enters, it can cause your Birds to deal a ton of damage to a creature to get rid of any problem creature your opponent(s) may have
Do this a few times and its a game-winner
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There are many more reasons beyond the mana difference why I would rather a Nihiri than a Pack Rat as a discard outlet in most situations
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