Artifact, 4 (4) Creatures you control have trample.
{1}{R}{G}: Gruul War Plow becomes a 4/4 Juggernaut artifact creature until end of turn. Steering apparatus?! What for? Rip it out, sharpen it, and lash it to the front! - Ktank, Gruul plowmaster
Illus. Martina Pilcerova
2/1/2006: While it's a creature, Gruul War Plow gives itself trample.
2/1/2006: While it's a creature, Gruul War Plow has creature type Juggernaut. It doesn't have any abilities associated with the card named Juggernaut.
8/1/2008: A noncreature permanent that turns into a creature is subject to the "summoning sickness" rule: It can only attack, and its {T} abilities can only be activated, if its controller has continuously controlled that permanent since the beginning of his or her most recent turn.