How can you create a combo with Gwenna, Eyes of Gaea, Cloudstone Curio, Death's Shadow?
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[START OF COMBO]This combo can be formed with Gwenna, Eyes of Gaea, Cloudstone Curio, Death's Shadow

Color identity: BG
Mana cost: 
Steps:
  1. Activate Gwenna by tapping it, adding {1}{B} that can only be spent to cast creature spells or to activate abilities of creature cards.
  2. Cast Death's Shadow by paying {B}.
  3. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
  4. When Death's Shadow enters the battlefield, Cloudstone Curio triggers, returning another nontoken nonartifact creature that can be cast using one colored mana from the battlefield to your hand.
  5. Cast the creature by paying its mana cost.
  6. When the creature enters the battlefield, Cloudstone Curio triggers, returning Death's Shadow from the battlefield to your hand.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on Gwenna
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Gwenna, Eyes of Gaea must be on the battlefield
  - Cloudstone Curio must be on the battlefield
  - Death's Shadow must be in your hand
  - You control a nontoken nonartifact creature that can be cast using one colored mana.
  - Gwenna does not have summoning sickness.
  - Your life total is twelve or less.
[END OF COMBO PREREQUISITES]
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