Engineer, Texan Defense

{t}:Flip a coin. If you win the flip, regenerate target artifact.
{3}:Choose one: •Create a 1/1 legendary colorless Sentry artifact creature token with defender and "{4}: Put two +1/+1 counters on this creature. Activate this ability only twice."
•Create a legendary Dispenser artifact token with "{t}: Prevent the next 1 damage that would be dealt to up to 3 target creatures until end of turn."