Other types of damage include combat damage
While I dont think Vivi is on the level of anything currently on the banlist, it does feel like a card that could be central to a future broken deck, especially if Mox Opal becomes part of the equation again
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While the effect of making a player lose the game by paying one mana of every color is a nice shortcut, since it requires your opponent to have ten or less life, most of the time you're better off saving that mana for spells since they'll be defeated soon anyways
Some good payoffs for playing a colorless deck are cards like All Is Dust or Ugin, the Spirit Dragons -X ability, which clear your opponents permanents from the board while allowing you to keep yours
At the beginning of your end step, if you control four or more artifacts, return target creature card from your graveyard to your hand