Dwarven Howitzer

Dwarven Howitzer enters the battlefield with a level
counter on it.

{t}: Dwarven Howitzer deals X damage to all enemy
creatures, where X is the number of level counters
on Dwarven Howitzer.

{3}{r}, {t}: If there are less than 3 level counters
on Dwarven Howitzer, put a level counter on it.

“Fully loaded!”