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You can get Aggravated Assault on the battlefield very early, which can then start giving you extra combats

A surprise part of green devotion decks (I know that sounds weird, but it can drop with a Storm the Festival or work with an Oath of Nissa) for a while, it provides another way to untap the various combo pieces like Nykthos, Shrine to Nyx in Pioneer and lesser entities like Nyx Lotus in Explorer

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This is achieved when you counter a creature or planeswalker spell with Syphon Essence