Depth Charge Colossus - The Brothers' War #78

Depth Charge Colossus

Set: The Brothers' War (BRO)
Collector Number: 78
Type: Artifact Creature — Dreadnought
Rarity: Common
Mana Value: 9.0

Prototype {4}{U}{U} — 6/6 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)
This creature doesn't untap during your untap step.
{3}: Untap this creature.