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Pharika is cheap enough (and in colors that can easily get its devotion going) that you can think about commander damage

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You can cast cards from the top of your deck that have either one of those keywords, effectively giving you a free card in your hand at all times, assuming the top of your deck works with you a bit

Vivi also combos with Quicksilver Elemental to create infinite mana and can even win the game if you have a way to cast infinite spells to ping down opponents