Retrofitter Foundry (Halo Foil)

{3}: Untap this artifact.{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.