How can you create a combo with Etali, Primal Conqueror // Etali, Primal Sickness, Leashling, Dual Nature, Cloudstone Curio?
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[START OF COMBO]This combo can be formed with Etali, Primal Conqueror // Etali, Primal Sickness, Leashling, Dual Nature, Cloudstone Curio

Color identity: RG
Mana cost: {11}{R}{R} plus enough mana to pay for commander tax, if applicable
Steps:
  1. Cast Leashling by paying {6}.
  2. When Leashling enters the battlefield, Dual Nature's first ability triggers, creating a token copy of Leashling.
  3. Cast Etali either from your hand or from the command zone by paying {5}{R}{R} plus commander tax, if applicable.
  4. When Etali enters the battlefield, it, Dual Nature's first ability and Cloudstone Curio trigger.
  5. Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand.
  6. Resolve the Dual Nature trigger, creating a token copy of Etali.
  7. Put the token Etali into your graveyard due to the legend rule.
  8. The token Etali and Cloudstone Curio trigger.
  9. Resolve the Cloudstone Curio trigger, returning Etali from the battlefield to your hand.
  10. When Etali leaves the battlefield, Dual Nature's second ability triggers, doing nothing.
  11. Activate the nontoken Leashling by putting Etali on top of your library from your hand, returning Leashling to your hand from the battlefield.
  12. When the nontoken Leashling leaves the battlefield, Dual Nature's second ability triggers.
  13. Holding priority, activate the token Leashling by putting Leashling on top of your library from your hand, returning the token Leashling to your hand from the battlefield.
  14. Resolve the Dual Nature trigger, doing nothing.
  15. Resolve the token Etali's trigger from step 8, causing each player to exile cards from the top of their library until they exile a nonland card, and allowing you to cast the nonland cards without paying their mana costs, with you casting Leashling from your library.
  16. When Leashling enters the battlefield, Dual Nature's first ability triggers, creating a token copy of Leashling.
  17. Resolve the nontoken Etali's trigger from step 4, causing each player to exile cards from the top of their library until they exile a nonland card, and allowing you to cast the nonland cards without paying their mana costs, with you casting Etali from your library.
  18. Repeat from step 4.[END OF COMBO STEPS]

Result:
  - Cast all nonland cards from each opponent's library
  - Exile each opponent's library
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite storm count
  - Near-infinite magecraft triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Etali, Primal Conqueror // Etali, Primal Sickness must be in your hand or in the command zone
  - Leashling must be in your hand
  - Dual Nature must be on the battlefield
  - Cloudstone Curio must be on the battlefield
[END OF COMBO PREREQUISITES]
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