Artifact Creature — Dreadnought

Depth Charge Colossus doesn't untap during your untap step.
{3}: Untap Depth Charge Colossus.
//PRT-Prototype_
Mech//
{4}{U}{U}
Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
6/6

Artist(s): Daniel Ljunggren