There are a ton of black-based decks that love to sacrifice things (and drain and gain, for that matter), so I think this will see some play
Do other examples exist
Dark Confidant In terms of life loss, [c]Dark Confidant[/c]s cost can be pretty steep, especially if the average mana cost of your cards is high
The first image in your reply appears to be from a Japanese sheet
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Also, when HP is reduced by 60% or more, it becomes like other Chilwondeok monsters, wearing a red bracelet, and greatly increases its attack power