MECA-WORM

When MECA-WORM enters the battlefield, put {x} Artifact Creatures into the battlefield, where {x} is the number of Artifact Creatures you control
{t}{2}, Artifact Creatures you control have {t} you gain 5 Life
{t}{x}, add {x} to your Mana pool
Oh, I'm a happy worm, yeah I'm a happy worm