Requires

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

Steps

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

Results