Artifact Creature — Juggernaut
5 / 3
This creature attacks each combat if able.
This creature can't be blocked by Walls.
If Juggernaut can't attack for any reason (such as being tapped or having come under your control that turn), then it doesn't attack. If there's a cost associated with having it attack, you're not forced to pay that cost, so it doesn't have to attack in that case either.