The MB724 Armor Piercing Tank debuted in 2007 in Battle Kings. It is only in the Battle Kings , and has tiny roller wheels.
1. Olive, green and black camoflage, Gray Treads, 2007 Battle Kings
2. Brick Red, United Alliance and Military Camoflage, Gray Treads, Battle Kings
3. Gray, Rogue 724 and gray camo on sides, Black Treads, 2009 Battle Kings