How can you create a combo with Etrata, the Silencer, Lithoform Engine, Strionic Resonator?
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[START OF COMBO]This combo can be formed with Etrata, the Silencer, Lithoform Engine, Strionic Resonator

Color identity: UB
Mana cost: {4}
Steps:
  1. Deal combat damage to an opponent using Etrata, triggering its ability.
  2. Holding priority, activate Lithoform Engine's first ability by paying {2} and tapping it, copying that ability.
  3. Activate Strionic Resonator by paying {2} and tapping it, copying Etrata's ability.
  4. Resolve all Etrata abilities, causing you to exile three creatures the opponent controls with hit counters on them, shuffle Etrata into your library, and cause the opponent to lose the game.[END OF COMBO STEPS]

Result:
  - Target opponent loses the game[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Etrata does not have summoning sickness.
  - An opponent controls at least three nontoken creatures that they own and that are not commanders.
[END OF COMBO PREREQUISITES]
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