At the beginning of your combat phase, Mishra triggers, creating a token copy of Mindslaver that is a 4/4 artifact creature named Mishra's Warform in addition to it's other types.
Activate Mishra's Warform by paying {4}, tapping and sacrificing it, targeting an opponent.
Holding priority, activate Lithoform Engine's first ability by paying {2} and tapping it, copying Mishra's Warform's ability, targeting any other opponent.
Activate Tawnos by paying {U}{R} and tapping it, copying Mishra's Warform's ability, targeting any other opponent.
Resolve all Mishra's Warform abilities, causing you to gain control of the targeted opponents during their next turns.
Repeat during each of your turns.

You control up to three target opponents on each of their turns

Mishra, Eminent One

Mindslaver

Lithoform Engine

Tawnos, Urza's Apprentice

Deal combat damage to an opponent using Etrata, triggering its ability.
Holding priority, activate Lithoform Engine's first ability by paying {2} and tapping it, targeting Etrata's trigger.
Holding priority, activate Tawnos by paying {U}{R} and tapping it, copying Lithoform Engine's trigger, targeting Etrata's trigger.
Resolve both Lithoform Engine triggers, copying Etrata's trigger twice.
Resolve all Etrata triggers, exiling three creatures an opponent controls and putting hit counters on them, and then causing that opponent to lose the game.

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