Gwenna, Eyes of Gaea, Cloudstone Curio, and Death's Shadow

Prerequisites

• Gwenna, Eyes of Gaea on the battlefield
• Cloudstone Curio on the battlefield
• Death's Shadow in 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

Steps

1. Activate Gwenna by tapping it, adding that can only be spent to cast creature spells or to activate abilities of creature cards
2. Cast Death's Shadow by paying
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

Results

• Infinite +1/+1 counters on Gwenna
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count