Cloudstone Curio + Gwenna, Eyes of Gaea Combos

4 known combos featuring both cards in Commander

Infinite +1/+1 counters on a creature Infinite ETB Infinite LTB Infinite storm count Infinite death triggers

Combo 1 with Sheltering Ancient + Tempting Wurm

Results: Infinite +1/+1 counters on a creature · Infinite ETB · Infinite LTB · Infinite storm count
Steps
  1. Activate Gwenna by tapping it, adding {1}{G} that can only be spent to cast creature spells or activate abilities of creatures.
  2. Cast Tempting Wurm by paying {1}{G}.
  3. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
  4. Tempting Wurm enters the battlefield, triggering itself and Cloudstone Curio.
  5. Resolve the Tempting Wurm trigger, allowing each opponent to put any number of artifact, enchantment, creature and/or land cards from their hand onto the battlefield.
  6. Resolve the Cloudstone Curio trigger, returning Sheltering Ancient from the battlefield to your hand.
  7. Activate Gwenna by tapping it, adding {1}{G} that can only be spent to cast creature spells or activate abilities of creatures.
  8. Cast Sheltering Ancient by paying {1}{G}.
  9. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
  10. Sheltering Ancient enters the battlefield, triggering Cloudstone Curio, returning Tempting Wurm from the battlefield to your hand.
  11. Repeat.

Combo 2 with Death's Shadow

Also requires: Death's Shadow Death's Shadow
Results: Infinite +1/+1 counters on a creature · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Show 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.

Combo 3 with Grim Wanderer + Tempting Wurm

Results: Infinite +1/+1 counters on a creature · Infinite ETB · Infinite LTB · Infinite storm count
Show steps
  1. Activate Gwenna by tapping it, adding {1}{G} that can only be spent to cast creature spells or activate abilities of creatures.
  2. Cast Tempting Wurm by paying {1}{G}.
  3. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
  4. Tempting Wurm enters the battlefield, triggering itself and Cloudstone Curio.
  5. Resolve the Tempting Wurm trigger, allowing each opponent to put any number of artifact, enchantment, creature and/or land cards from their hand onto the battlefield.
  6. Resolve the Cloudstone Curio trigger, returning Grim Wanderer from the battlefield to your hand.
  7. Activate Gwenna by tapping it, adding {1}{B} that can only be spent to cast creature spells or activate abilities of creatures.
  8. Cast Grim Wanderer by paying {1}{B}.
  9. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
  10. Grim Wanderer enters the battlefield, triggering Cloudstone Curio, returning Tempting Wurm from the battlefield to your hand.
  11. Repeat.

Combo 4 with Grim Wanderer + Sheltering Ancient

Results: Infinite +1/+1 counters on a creature · Infinite ETB · Infinite LTB · Infinite storm count
Show steps
  1. Activate Gwenna by tapping it, adding {1}{B} that can only be spent to cast creature spells or activate abilities of creatures.
  2. Cast Grim Wanderer by paying {1}{B}.
  3. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
  4. Grim Wanderer enters the battlefield, triggering Cloudstone Curio, returning Sheltering Ancient from the battlefield to your hand.
  5. Activate Gwenna by tapping it, adding {1}{G} that can only be spent to cast creature spells or activate abilities of creatures.
  6. Cast Sheltering Ancient by paying {1}{G}.
  7. Gwenna triggers, putting a +1/+1 counter on it and untapping it.
  8. Sheltering Ancient enters the battlefield, triggering Cloudstone Curio, returning Grim Wanderer from the battlefield to your hand.
  9. Repeat.
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