Molten Echoes, Cloudstone Curio, and Mardu Warshrieker

Prerequisites

• Molten Echoes on the battlefield
• Cloudstone Curio on the battlefield
• Mardu Warshrieker in hand
• "Orc" or "Shaman" chosen with Molten Echoes
• You have attacked this turn
• available

Steps

1. Cast Mardu Warshrieker by paying
2. Mardu Warshrieker enters the battlefield, triggering itself, Cloudstone Curio and Molten Echoes
3. Resolve the Mardu Warshrieker trigger, adding
4. Resolve the Cloudstone Curio trigger, choosing to return nothing from the battlefield to your hand
5. Resolve the Molten Echoes trigger, creating a token copy of Mardu Warshrieker with haste
6. The Mardu Warshrieker token enters the battlefield, triggering itself and Cloudstone Curio
7. Resolve the Mardu Warshrieker trigger, adding
8. Resolve the Cloudstone Curio trigger, returning the nontoken Mardu Warshrieker from the battlefield to your hand
9. Repeat

Results

• Infinite black mana
• Infinite creature tokens with haste
• Infinite ETB
• Infinite LTB
• Infinite red mana
• Infinite storm count
• Infinite white mana