Retrofitter Technician

{3}: Untap Retrofitter Technician.
{2}{t}: Create a 1/1 colorless Servo artifact
creature token.
{1}{t} Sacrifice a Servo: Create a 1/1 colorless
Thopter artifact creature token with flying.
{t}, Sacrifice a Thopter: Create a 4/4 colorless
Construct artifact creature token.
"Elves skilled in crafting upgrading constructs moved
to colonial base forts found excitement, profit,
and reasonable safety .