Molten Echoes | Changeling Hero

Cards

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