Juggernaut

Juggernaut is an artifact creature type used for large, mercilessly destructive and unstoppable forces or objects.

The first creature to bear the type was the original Juggernaut in Alpha. Other examples include Mishra's War Machine, Urza's Engine, Keldon Battlewagon and Phyrexian Juggernaut. Juggernauts typically can't be blocked by walls, attack each turn if able and/or have trample.