Engineer, Fortification Expert

Stacked 1 (Whenever this creature gains a +1/+1 counter, you may create a Turret Construct token it is a 0/3 colorless
Defender artifact creature token with "{t}: This creature deals 1 damage to target attacking or blocking creature.")
"With gears whirring and tools in hand, the engineer constructs sturdy turrets to defend against the encroaching darkness."