Molten Echoes | Unstoppable Ash

Cards

Cast
Unstoppable Ash by paying its mana cost.
When
Unstoppable Ash enters the battlefield, its champion ability and
Molten Echoes triggers.
Resolve the
Molten Echoes trigger, creating a token copy of
Unstoppable Ash with haste.
When the
Unstoppable Ash token enters the battlefiled, its champion ability triggers, exiling the nontoken
Unstoppable Ash until the token
Unstoppable Ash leaves the battlefield.
Resolve the champion ability from step 2, exiling the token
Unstoppable Ash.
The token
Unstoppable Ash leaves the battlefield, returning the nontoken
Unstoppable Ash from exile to the battlefield.
Repeat from step 2.