Requires

Molten Echoes must be on the battlefield. Cloudstone Curio must be on the battlefield. Priest of Urabrask must be in hand. "Human" or "Cleric" chosen with Molten Echoes. Mana needed:

Steps

1. Cast Priest of Urabrask by paying .
2. Priest of Urabrask enters the battlefield, triggering itself, Cloudstone Curio and Molten Echoes.
3. Resolve the Priest of Urabrask 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 Priest of Urabrask with haste.
6. The Priest of Urabrask token enters the battlefield, triggering itself and Cloudstone Curio.
7. Resolve the Priest of Urabrask trigger, adding .
8. Resolve the Cloudstone Curio trigger, returning the nontoken Priest of Urabrask from the battlefield to your hand.
9. Repeat.

Results