Necklace of Mechanics

Whenever Necklace of Mechanics enters the battlefield, create two 1/1 artifact creature tokens
{2}, {t}: create a 3/3 vehicle artifact with Crew 1
{3}, {t}: each vehicle you control gets +1/+1 and its crew is reduced by 1 until end of turn
{6}, sacrifice Necklace of Mechanics: crew all vehicles you control