Trade Cart

When Trade Cart enters the battlefield, create
three colorless Metal artifact token with "Sacrifice
this artifact: Add {c}".
Trade Cart cannot be blocked except by three or
more creatures.
Whenever Trade Cart attacks and isn't blocked,
you and defending player may both create one
Metal token.
Effects that would increase Trade Carts power to
more than 0 increase it to 0 instead.
"Our long and dangerous journey here was..."