Card name: Juggernaut
Mana Cost: CMC4
Converted Mana Cost: 4
Types: Artifact Creature — Juggernaut
Card Text: Juggernaut attacks each turn if able.

Juggernaut can't be blocked by Walls.

Flavor Text: Many a besieged city has surrendered upon hearing the distinctive rumble of the juggernaut.
P/T: (5/3)
Expansion: DU Starter set
Rarity: Uncommon

Card rulings (?)
2016-06-08 If, during your declare attackers step, Juggernaut is tapped, is affected by a spell or ability that says it can't attack, or you haven't controlled it continuously since the beginning of your turn, then it doesn't attack. If there's a cost associated with having Juggernaut attack, you aren't forced to pay that cost, so it doesn't have to attack in that case either.
2016-06-08 If there are multiple combat phases in a turn, Juggernaut must attack only in the first one in which it's able to.