Humpty Dumpty

{t}: Gain control of target non-legendary creature. (This effect lasts indefinitely.) It loses all abilities,
and becomes a 0/3 artifact creature with defender
When Humpty Dumpty dies, put three colorless
0/1 Shell artifact creature tokens onto the battlefield.
If Humpty Dumpty would be put onto battlefield
and you control at least one Shell token, instead
place Humpty Dumpty into the command zone.