Boeing B-29 Superfortress

Flying, Crew 10, Bomb 15.
When B-29 enters the battlefield, create two White 1/1 pilot creature token
Whenever B-29 Attacks, you may have it gain Bomb X until end of turn. Then, roll a d20. If your roll is less then half of X, sacrifice B-29.
Capable of carrying two Grand Slam Bombs, the
B-29 was the ultimate heavy bomber.