Cast Echoing Equation by paying {3}{U}{U}, causing each other creature you control to become a nonlegendary copy of Etrata.
Deal combat damage to an opponent with Etrata and two other creatures you control.
Etrata and the two creatures trigger.
Resolve the first Etrata trigger, exiling a nontoken creature the opponent controls with a hit counter on it, and shuffle Etrata into your library.
Repeat step 4 one additional time.
Resolve the last Etrata trigger, exiling a nontoken creature the opponent controls with a hit counter on it, shuffle Etrata into your library, and cause the opponent to lose the game.

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