Molten Echoes | Changeling Titan

Cards

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