When Stangg enters the battlefield, create a legendary 3/4 red and green Human Warrior creature token named Stangg Twin. Exile that token when Stangg leaves the battlefield. Sacrifice Stangg when that token leaves the battlefield.
3/16/2018 If Stangg leaves the battlefield before its ability has resolved, that ability will still create a Stangg Twin token, but its delayed triggered ability that exiles the token will never have a chance to trigger. That token will remain on the battlefield.