Cloudstone Curio + Death's Shadow Combos

2 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite storm count

Combo 1 with Phyrexian Altar + Life Finds a Way

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Steps
  1. Cast Death's Shadow by paying {B}.
  2. When Death's Shadow enters the battlefield, Cloudstone Curio and Life Finds a Way trigger.
  3. Resolve the Cloudstone Curio trigger, doing nothing.
  4. Resolve the Life Finds a Way trigger, creating a copy of any nonartifact creature token you control.
  5. When the creature token enters the battlefield, Cloudstone Curio triggers, returning Death's Shadow to your hand from the battlefield.
  6. Activate Phyrexian Altar by sacrificing a creature token, adding {B}.
  7. Repeat.

Combo 2 with Gwenna, Eyes of Gaea

Also requires: Gwenna, Eyes of Gaea Gwenna, Eyes of Gaea
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.
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